Fleischmann and Pons reply

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This is a subpage of Morrison Fleischmann debate

This copy is taken from a document showing the Morrison comment and the Fleischmann reply. That itself may have been taken from sci.physics.fusion, posted August 17, 1993 by Mitchell Swartz. The reply was published eventually as “Reply to the critique by Morrison entitled: “Comments on claims of excess enthalpy by Fleischmann and Pons using simple cells made to boil,” M. Fleischmann, S. Pons, Physics Letters A 187, 18 April 1994 276-280. [Britz Flei1994b]

Received 28 June 1993, revised manuscript received 18 February 1994, accepted for publication 21 February 1994. Communicated by J P Vigier.

Abstract

We reply here to the critique by Douglas Morrison [1] of our paper [2] which was recently
published in this Journal. Apart from his general classification of our experiments into stages 1-
5, we find that the comments made [1] are either irrelevant or inaccurate or both.

In the article “Comments on Claims of Excess Enthalpy by Fleishmann and Pons using simple
cells made to Boil” Douglas Morrison presents a critique [1] of the paper “Calorimetry of the Pd-
D2O system: from simplicity via complications to simplicity” which has recently been published
in this Journal [2]. In the introduction to his critique, Douglas Morrison has divided the timescale
of the experiments we reported into 5 stages. In this reply, we will divide our comments
into the same 5 parts. However, we note at the outset that Douglas Morrison has restricted his
critique to those aspects of our own paper which are relevant to the generation of high levels of
the specific excess enthalpy in Pd-cathodes polarized in D2O solutions i.e. to stages 3-5. By
omitting stages 1 and 2, Douglas Morrison has ignored one of the most important aspects of our
paper and this, in turn, leads him to make several erroneous statements. We therefore start our
reply by drawing attention to these omissions in Douglas Morrison’s critique.

Stages 1 and 2

In the initial stage of these experiments the electrodes (0.2mm diameter x
12.5mm length Pd-cathodes) were first polarised at 0.2A, the current being raised to 0.5A in
stage 2 of the experiments.

We note at the outset that Douglas Morrison has not drawn attention to the all important “blank
experiments” illustrated in Figs 4 and 6 or our paper by the example of a Pt cathode polarised in
the identical 0.1M LiOD electrolyte. By ignoring this part of the paper he has failed to
understand that one can obtain a precise calibration of the cells (relative standard deviation
0.17%) in a simple way using what we have termed the “lower bound heat transfer coefficient,
(kR’)11”, based on the assumption that there is zero excess enthalpy generation in such “blank
cells”. We have shown that the accuracy of this value is within 1 sigma of the precision of the
true value of the heat transfer coefficient, (kR’)2, obtained by a simple independent calibration
using a resistive Joule heater. Further methods of analysis [3] (beyond the scope of the particular
paper [2]) show that the precision of (kR’)11 is also close to the accuracy of this heat transfer
coefficient (see our discussion of stage 3).

We draw attention to the fact that the time-dependence of (kR’)11, (the simplest possible way of
characterising the cells) when applied to measurements for Pd-cathodes polarised in D2O
solutions, gives direct evidence for the generation of excess enthalpy in these systems. It is quite
unnecessary to use complicated methods of data analysis to demonstrate this fact in a semiquantitative
fashion.

Stage 3 Calculations

Douglas Morrison starts by asserting: “Firstly, a complicated non-linear
regression analysis is employed to allow a claim of excess enthalpy to be made”. He has failed
to observe that we manifestly have not used this technique in this paper [2], the aim of which has
been to show that the simplest methods of data analysis are quite sufficient to demonstrate the
excess enthalpy generation. The only point at which we made reference to the use of non-linear
regression fitting (a technique which we used in our early work [4]) was in the section dealing
with the accuracy of the lower bound heat transfer coefficient, (kR’)11, determined for “blank
experiments” using Pt-cathodes polarised in D2O solutions. At that point we stated that the
accuracy of the determination of the coefficient (kR’)2 (relative standard deviation ~1.4% for the
example illustrated [2]), can be improved so as to be better than the precision of (kR’)11 by using
non-linear regression fitting; we have designated the values of (kR’) determined by non-linear
regression fitting by (kR’)5. The values of (kR’)5 obtained show that the precision of the lower
bound heat transfer coefficient (kR’)11 for “blank experiments” can indeed be taken as a measure
of the accuracy of (kR’). For the particular example illustrated the relative standard deviation was
~ 0.17% of the mean. It follows that the calibration of the cells using such simple means can be
expected to give calorimetric data having an accuracy set by this relative standard deviation in
the subsequent application of these cells.

We note here that we introduced the particular method of non-linear regression fitting (of the
numerical integral of the differential equation representing the model of the calorimeter to the
experimental data) for three reasons: firstly, because we believe that it is the most accurate single
method (experience in the field of chemical kinetics teaches us that this is the case); secondly,
because it avoids introducing any personal bias in the data treatment; thirdly, because it leads to
direct estimates of the standard deviations of all the derived values from the diagonal elements of
the error matrix. However, our experience in the intervening years has shown us that the use of
this method is a case of “overkill”: it is perfectly sufficient to use simpler methods such as multilinear
regression fitting if one aims for high accuracy. This is a topic which we will discuss
elsewhere [3]. For the present, we point out again that the purpose of our recent paper [2] was to
illustrate that the simplest possible techniques can be used to illustrate the generation of excess
enthalpy. It was for this reason that we chose the title: “Calorimetry of the Pd-D2O system: from
simplicity via complications to simplicity”.
Douglas Morrison ignores such considerations because his purpose evidently is to introduce a
critique of our work which has been published by the group at General Electric [5]. We will
show below that this critique is totally irrelevant to the recent paper published in this Journal [2].
However, as Douglas Morrison has raised the question of the critique published by General
Electric, we would like to point out once again that we have no dispute regarding the particular
method of data analysis favoured by that group [5]: their analysis is in fact based on the heat
transfer coefficient (kR’)2. If there was an area of dispute, then this was due solely to the fact that
Wilson et al introduced a subtraction of an energy term which had already been allowed for in
our own data analysis, i.e. they made a “double subtraction error”. By doing this they derived
heat transfer coefficients which showed that the cells were operating endothermically, i.e. as
refrigerators! Needless to say, such a situation contravenes the Second Law of Thermodynamics
as the entropy changes have already been taken into account by using the thermoneutral potential
of the cells.
We will leave others to judge whether our reply [6] to the critique by the group at General
Electric [5] did or did not “address the main questions posed by Wilson et al.” (in the words of
Douglas Morrison). However, as we have noted above the critique produced byWilson et al [5]
is in any event irrelevant to the evaluations presented in our paper in this journal [2]: we have
used the self-same method advocated by that group to derive the values of the excess enthalpy
given in our paper. We therefore come to a most important question: “given that Douglas
Morrison accepts the methods advocated by the group at General Electric and, given that we
have used the same methods in the recent publication [2] should he not have accepted the
validity of the derived values?”

Stage 4 Calculation

Douglas Morrison first of all raises the question whether parts of the cell contents may have been expelled as droplets during the later stages of intense heating. This is readily answered by titrating the residual cell contents: based on our earlier work about 95% of the residual lithium deuteroxide is recovered; some is undoubtedly lost in the reaction of this “aggressive” species with the glass components to form residues which cannot be titrated.

Furthermore, we have found that the total amounts of D2O added to the cells (in some cases over
periods of several months) correspond precisely to the amounts predicted to be evolved by (a)
evaporation of D2O at the instantaneous atmospheric pressures and (b) by electrolysis of D2O to
form D2 and O2 at the appropriate currents; this balance can be maintained even at temperatures
in excess of 90 degrees C [7]

We note here that other research groups (eg [5]) have reported that some Li can be detected
outside the cell using atomic absorption spectroscopy. This analytic technique is so sensitive
that it will undoubtedly detect the expulsion of small quantities of electrolyte in the vapour
stream. We also draw attention to the fact that D2O bought from many suppliers contains
surfactants. These are added to facilitate the filling of NMR sample tubes and are difficult
(probably impossible) to remove by normal methods of purification. There will undoubtedly be
excessive foaming (and expulsion of foam from the cells) if D2O from such sources is used. We
recommend the routine screening of the sources of D2O and of the cell contents using NMR
techniques. The primary reason for such routine screening is to check on the H2O content of the
electrolytes.

Secondly, Douglas Morrison raises the question of the influence of A.C. components of the
current, an issue which has been referred to before and which we have previously answered [4].
It appears that Douglas Morrison does not appreciate the primary physics of power dissipation
from a constant current source controlled by negative feedback. Our methodology is exactly the
same as that which we have described previously [4]; it should be noted in addition that we have
always taken special steps to prevent oscillations in the galvanostats. As the cell voltages are
measured using fast sample-and-hold systems, the product (Ecell – Ethermoneutral, bath)I will give the mean enthalpy input to the cells: the A.C. component is therefore determined by the ripple
content of the current which is 0.04%.

In his third point on this section, Douglas Morrison appears to be re-establishing the transition
from nucleate to film boiling based on his experience of the use of bubble chambers. This
transition is a well-understood phenomenon in the field of heat transfer engineering. A careful
reading of our paper [2] will show that we have addressed this question and that we have pointed
out that the transition from nucleate to film boiling can be extended to 1-10kW cm-2 in the
presence of electrolytic gas evolution.

Fourthly and for good measure, Douglas Morrison once again introduces the question of the
effect of a putative catalytic recombination of oxygen and deuterium (notwithstanding the fact
that this has repeatedly been shown to be absent). We refer to this question in the next section;
here we note that the maximum conceivable total rate of heat generation (~ 5mW for the
electrode dimensions used) will be reduced because intense D2 evolution and D2O evaporation
degasses the oxygen from the solution in the vicinity of the cathode; furthermore, D2 cannot be
oxidised at the oxide coated Pt-anode. We note furthermore that the maximum localised effect
will be observed when the density of the putative “hot spots” will be 1/delta2 where delta is the
thickness of the boundary layer. This gives us a maximum localised rate of heating of ~ 6nW.
The effects of such localised hot spots will be negligible because the flow of heat in the metal
(and the solution) is governed by Laplace’s Equation (here Fourier’s Law). The spherical
symmetry of the field ensures that the temperature perturbations are eliminated (compare the
elimination of the electrical contact resistance of two plates touching at a small number of
points).

We believe that the onus is on Douglas Morrison to devise models which would have to be
taken seriously and which are capable of being subjected to quantitative analysis. Statements of
the kind which he has made belong to the category of “arm waving”.

Stage 5 Effects

In this section we are given a good illustration of Douglas Morrison’s selective
and biased reporting. His description of this stage of the experiments starts with an incomplete
quotation of a single sentence in our paper. The full sentence reads:

“We also draw attention to some further important features: provided satisfactory electrode
materials are used, the reproducibility of the experiments is high; following the boiling to
dryness and the open-circuiting of the cells, the cells nevertheless remain at a high temperature
for prolonged periods of time (fig 11); furthermore the Kel-F supports of the electrodes at the
base of the cells melt so that the local temperature must exceed 300 degrees C”.

Douglas Morrison translates this to: “Following boiling to dryness and the open-circuiting of
the cells, the cells nevertheless remain at high temperature for prolonged periods of time;
furthermore the Kel-F supports of the electrodes at the base of the cells melt so that the local
temperature must exceed 300 degrees C”.

Readers will observe that the most important part of the sentence, which we have underlined, is
omitted; we have italicised the words “satisfactory electrode materials” because that is the nub of
the problem. In common with the experience of other research groups, we have had numerous
experiments in which we have observed zero excess enthalpy generation. The major cause
appears to be the cracking of the electrodes, a phenomenon which we will discuss elsewhere.
With respect to his own quotation Douglas Morrison goes on to say: “No explanation is given
and fig 10 is marked ‘cell remains hot, excess heat unknown'”. The reason why we refrained
from speculation about the phenomena at this stage of the work is precisely because explanations
are just that: speculations. Much further work is required before the effects referred to can be
explained in a quantitative fashion. Douglas Morrison has no such inhibitions, we believe
mainly because in the lengthy section Stage 5 Effects he wishes to disinter “the cigarette lighter
effect”. This phenomenon (the combustion of hydrogen stored in palladium when this is exposed
to the atmosphere) was first proposed by Kreysa et al [8] to explain one of our early
observations: the vapourisation of a large quantity of D2O (~ 500ml) by a 1cm cube palladium
cathode followed by the melting of the cathode and parts of the cell components and destruction
of a section of the fume cupboard housing the experiment [9]. Douglas Morrison (in common
with other critics of “Cold Fusion”) is much attached to such “Chemical Explanations” of the
“Cold Fusion” phenomena. As this particular explanation has been raised by Douglas Morrison,
we examine it here.

In the first place we note that the explanation of Kreysa et al [8] could not possibly have
applied to the experiment in question: the vapourisation of the D2O alone would have required
~1.1MJ of energy whereas the combustion of all the D in the palladium would at most have
produced ~ 650J (assuming that the D/Pd ratio had reached ~1 in the cathode), a discrepancy of a
factor of ~ 1700. In the second place, the timescale of the explanation is impossible: the
diffusional relaxation time is ~ 29 days whereas the phenomenon took at most ~ 6 hours (we
have based this diffusional relaxation time on the value of the diffusion coefficient in the alphaphase;
the processes of phase transformation coupled to diffusion are much slower in the fully
formed Pd-D system with a corresponding increase of the diffusional relaxation time for the
removal of D from the lattice). Thirdly, Kreysa et al [8] confused the notion of power (Watts)
with that of energy (Joules) which is again an error which has been promulgated by critics
seeking “Chemical Explanations” of “Cold Fusion”. Thus Douglas Morrison reiterates the notion
of heat flow, no doubt in order to seek an explanation of the high levels of excess enthalpy
during Stage 4 of the experiments. We observe that at a heat flow of 144.5W (corresponding to
the rate of excess enthalpy generation in the experiment discussed in our paper [2] the total
combustion of all the D in the cathode would be completed in ~ 4.5s, not the 600s of the duration
of this stage. Needless to say, the D in the lattice could not reach the surface in that time (the
diffusional relaxation time is ~ 105s) while the rate of diffusion of oxygen through the boundary
layer could lead at most to a rate of generation of excess enthalpy of ~ 5mW.

Douglas Morrison next asserts that no evidence has been presented in the paper about stages
three or four using H2O in place of D2O. As has already been pointed out above he has failed to
comment on the extensive discussion in our paper of a “blank experiment”. Admittedly, the
evidence was restricted to stages 1 and 2 of his own classification but a reference to an
independent review of our own work [10] will show him and interested readers that such cells
stay in thermal balance to at least 90 degrees C (we note that Douglas Morrison was present at
the Second Annual Conference on Cold Fusion). We find statements of the kind made by
Douglas Morrison distasteful. Have scientists now abandoned the notion of verifying their facts
before rushing into print?

In the last paragraph of this section Douglas Morrison finally “boxes himself into a corner”:
having set up an unlikely and unworkable scenario he finds that this cannot explain Stage 5 of
the experiment. In the normal course of events this should have led him to: (i) enquire of us
whether the particular experiment is typical of such cells; (ii) to revise his own scenario. Instead,
he implies that our experiment is incorrect, a view which he apparently shares with Tom Droege
[11]. However, an experimental observation is just that: an experimental observation. The fact
that cells containing palladium and palladium alloy cathodes polarised in D2O solutions stay at
high temperatures after they have been driven to such extremes of excess enthalpy generation
does not present us with any difficulties. It is certainly possible to choose conditions which also
lead to “boiling to dryness” in “blank cells” but such cells cool down immediately after such
“boiling to dryness”. If there are any difficulties in our observations, then these are surely in the
province of those seeking explanations in terms of “Chemical Effects” for “Cold Fusion”. It is
certainly true that the heat transfer coefficient for cells filled with gas (N2) stay close to those for
cells filled with 0.1M Li0D (this is not surprising because the main thermal impedance is across
the vacuum gap of the Dewar-type cells). The “dry cell” must therefore have generated ~120kJ
during the period at which it remained at high temperature (or ~ 3MJcm-3 or 26MJ(mol Pd)-1).
We refrained from discussing this stage of the experiments because the cells and procedures we
have used are not well suited for making quantitative measurements in this region. Inevitably,
therefore, interpretations are speculative. There is no doubt, however, that Stage 5 is probably
the most interesting part of the experiments in that it points towards new systems which merit
investigation. Suffice it to say that energies in the range observed are not within the realm of any
chemical explanations.
We do, however, feel that it is justified to conclude with a further comment at this point in
time. Afficionados of the field of “Hot Fusion” will realise that there is a large release of excess
energy during Stage 5 at zero energy input. The system is therefore operating under conditions
which are described as “Ignition” in “Hot Fusion”. It appears to us therefore that these types of
systems not only “merit investigation” (as we have stated in the last paragraph) but, more
correctly, “merit frantic investigation”.

Douglas Morrison’s Section “Conclusions” and some General Comments

In his section entitled “Conclusions”, Douglas Morrison shows yet again that he does not
understand the nature of our experimental techniques, procedures and methods of data evaluation
(or, perhaps, that he chooses to misunderstand these?). Furthermore, he fails to appreciate that
some of his own recommendations regarding the experiment design would effectively preclude
the observation of high levels of excess enthalpy. We illustrate these shortcomings with a
number of examples:

(i) Douglas Morrison asserts that accurate calorimetry requires the use of three thermal
impedances in series and that we do not follow this practice. In point of fact we do have three
impedances in series: from the room housing the experiments to a heat sink (with two
independent controllers to thermostat the room itself); from the thermostat tanks to the room
(and, for good measure, from the thermostat tanks to further thermostatically controlled sinks);
finally, from the cells to the thermostat tanks. In this way, we are able to maintain 64
experiments at reasonable cost at any one time (typically two separate five-factor experiments).

(ii) It is naturally essential to measure the heat flow at one of these thermal impedances and we
follow the normal convention of doing this at the innermost surface (we could hardly do
otherwise with our particular experiment design!). In our calorimeters, this thermal impedance is
the vacuum gap of the Dewar vessels which ensures high stability of the heat transfer
coefficients. The silvering of the top section of the Dewars (see Fig 2 of our paper [2] further
ensures that the heat transfer coefficients are virtually independent of the level of electrolyte in
the cells.

(iii) Douglas Morrison suggests that we should use isothermal calorimetry and that, in some
magical fashion, isothermal calorimeters do not require calibration. We do not understand: how
he can entertain such a notion? All calorimeters require calibration and this is normally done by
using an electrical resistive heater (following the practice introduced by Joule himself). Needless
to say, we use the same method. We observe that in many types of calorimeter, the nature of the
correction terms are “hidden” by the method of calibration. Of course, we could follow the selfsame
practice but we choose to allow for some of these terms explicitly. For example, we allow
for the enthalpy of evaporation of the D2O. We do this because we are interested in the operation
of the systems under extreme conditions (including “boiling”) where solvent evaporation
becomes the dominant form of heat transfer (it would not be sensible to include the dominant
term into a correction).

(iv) There is, however, one important aspect which is related to (iii) i.e. the need to calibrate the
calorimeters. If one chooses to measure the lower bound of the heat transfer coefficient (as we
have done in part of the paper published recently in this journal [2]) then there is no need to carry
out any calibrations nor to make corrections. It is then quite sufficient to investigate the time
dependence of this lower bound heat transfer coefficient in order to show that there is a
generation of excess enthalpy for the Pd-D2O system whereas there is no such generation for
appropriate blanks (e.g. Pt-D2O or Pd-H2O). Alternatively, one can use the maximum value of
the lower bound heat transfer coefficient to give lower bound values of the rates of excess
enthalpy generation.

It appears to us that Douglas Morrison has failed to understand this point as he continuously
asserts that our demonstrations of excess enthalpy generation are dependent on calibrations and
corrections.

(v) Further with regard to (iii) it appears to us that Douglas Morrison believes that a “null
method” (as used in isothermal calorimeters) is inherently more accurate than say the
isoperibolic calorimetry which we favour. While it is certainly believed that “null” methods in
the Physical Sciences can be made to be more accurate than direct measurements (e.g. when a
voltage difference is detected as in bridge circuits: however, note that even here the advent of
“ramp” methods makes this assumption questionable) this advantage disappears when it is
necessary to transduce the primary signal. In that case the accuracy of all the methods is
determined by the measurement accuracy (here of the temperature) quite irrespective of which
particular technique is used.

In point of fact and with particular reference to the supposed advantages of isothermal versus
isoperibolic calorimetry, we note that in the former the large thermal mass of the calorimeter
appears across the input of the feedback regulator. The broadband noise performance of the
system is therefore poor; attempts to improve the performance by integrating over long times
drive the electronics into 1/f noise and, needless to say, the frequency response of the system is
degraded. (see also (vii) below)

(vi) with regard to implementing measurements with isothermal calorimeters, Douglas
Morrrison recommends the use of internal catalytic recombiners (so that the enthalpy input to the
system is just Ecell.I rather than (Ecell – Ethermoneutral, bath).I as in our “open” calorimeters. We find it interesting that Douglas Morrison will now countenance the introduction of intense local “hot
spots” on the recombiners (what is more in the gas phase!) whereas in the earlier parts of his
critique he objects to the possible creation of microscopic “hot spots” on the electrode surfaces
in contact with the solution.

We consider this criticism from Douglas Morrison to be invalid and inapplicable. In the first
place it is inapplicable because the term Ethermoneutral,bath.I (which we require in our analysis) is
known with high precision (it is determined by the enthalpy of formation of D2O from D2 and
1/2 O2). In the second place it is inapplicable because the term itself is ~ 0.77 Watt whereas we
are measuring a total enthalpy output of ~ 170 Watts in the last stages of the experiment.
(vii) We observe here that if we had followed the advice to use isothermal calorimetry for the
main part of our work, then we would have been unable to take advantage of the “positive
feedback” to drive the system into regions of high excess enthalpy generation (perhaps, stated
more exactly, we would not have found that there is such positive feedback). The fact that there
is such feedback was pointed out by Michael McKubre at the Third Annual Conference of Cold
Fusion and strongly endorsed by one of us (M.F.). As this issue had then been raised in public,
we have felt free to comment on this point in our papers (although we have previously drawn
attention to this fact in private discussions). We note that Douglas Morrison was present at the
Third Annual Conference on Cold Fusion.

(viii) While it is certainly true that the calorimetric methods need to be evolved, we do not
believe that an emphasis on isothermal calorimetry will be useful. For example, we can identify
three major requirements at the present time:

a) the design of calorimeters which allow charging of the electrodes at low thermal inputs and
temperatures below 50 degrees C followed by operation at high thermal outputs and
temperatures above 100 degrees C
b) the design of calorimeters which allow the exploration of Stage 5 of the experiments
c) the design of calorimeters having a wide frequency response in order to explore the transfer
functions of the systems.

We note that c) will in itself lead to calorimeters having an accuracy which could hardly be
rivalled by other methods.

(ix) Douglas Morrison’s critique implies that we have never used calorimetric techniques other
than that described in our recent paper [2]. Needless to say, this assertion is incorrect. It is true,
however, that we have never found a technique which is more satisfactory than the isoperibolic
method which we have described. It is also true that this is the only method which we have found
so far which can be implemented within our resources for the number of experiments which we
consider to be necessary. In our approach we have chosen to achieve accuracy by using
software; others may prefer to use hardware. The question as to which is the wiser choice is
difficult to answer: it is a dilemma which has to be faced frequently in modern experimental
science. We observe also that Douglas Morrison regards complicated instrumentation (three
feedback regulators working in series) as being “simple” whereas he regards data analysis as
being complicated.

Douglas Morrrison also asserts that we have never used more than one thermistor in our
experimentation and he raises this issue in connection with measurements on cells driven to
boiling. Needless to say, this assertion is also incorrect. However, further to this remark is it
necessary for us to point out that one does not need any temperature measurement in order to
determine the rate of boiling of a liquid?

(x) Douglas Morrison evidently has difficulties with our application of non-linear regression
methods to fit the integrals of the differential equations to the experimental data. Indeed he has
such an idee fixe regarding this point that he maintains that we used this method in our recent
paper [2]; we did not do so (see also ‘stage 3 calculations’ above). However, we note that we find
his attitude to the Levenberg-Marquardt algorithm hard to understand. It is one of the most
powerful, easily implemented “canned software” methods for problems of this kind. A classic
text for applications of this algorithm [12] has been praised by most prominent physics journals
and magazines.

(xi) Douglas Morrison’s account contains numerous misleading comments and descriptions. For
example, he refers to our calorimeters as “small transparent test tubes”. It is hard for us to
understand why he chooses to make such misleading statements. In this particular case he could
equally well have said “glass Dewar vessels silvered in their top portion” (which is accurate)
rather than “small transparent test tubes” (which is not). Alternatively, if he did not wish to
provide an accurate description, he could simply have referred readers to Fig 2 of our paper [2].
This type of misrepresentation is a non-trivial matter. We have never used calorimeters made of
test-tubes since we do not believe that such devices can be made to function satisfactorily.

(xii) As a further example of Douglas Morrison’s inaccurate reporting, we quote his last
paragraph in full:

“It is interesting to note that the Fleischmann and Pons paper compares their claimed power
production with that from nuclear reactions in a nuclear reactor and this is in line with their
dramatic claims (9) that “`SIMPLE EXPERIMENT’ RESULTS IN SUSTAINED N-FUSION AT
ROOM TEMPERATURE FOR THE FIRST TIME: breakthrough process has potential to provide
inexhaustible source of energy”.

It may be noted that the present paper does not mention “Cold Fusion” nor indeed consider a possible nuclear source for the excess heat claimed.

Douglas Morrison’s reference (9) reads: “Press release, University of Utah, 23 March 1989.” With regard to this paragraph we note that:

a) our claim that the phenomena cannot be explained by chemical or conventional physical
processes is based on the energy produced in the various stages and not the power output
b) the dramatic claim he refers to was made by the Press Office of the University of Utah and
not by us
c) we did not coin the term “Cold Fusion” and have avoided using this term except in those
instances where we refer to other research workers who have described the system in this way.
Indeed, if readers refer to our paper presented to the Third International Conference on Cold
Fusion [13] (which contains further information about some of the experiments described in [2]),
they will find that we have not used the term there. Indeed, we remain as convinced as ever that
the excess energy produced cannot be explained in terms of the conventional reaction paths of
“Hot Fusion”
d) it has been widely stated that the editor of this journal “did not allow us to use the term Cold
Fusion”. This is not true: he did not forbid us from using this term as we never did use it (see
also [13]).

(xiii) in his section “Conclusions”, Douglas Morrison makes the following summary of his
opinion of our paper:

The experiment and some of the calculations have been described as “simple”. This is incorrect
– the process involving chaotic motion, is complex and may appear simple by incorrectly
ignoring important factors. It would have been better to describe the experiments as “poor”
rather than “simple”.

We urge the readers of this journal to consult the original text [2] and to read Douglas
Morrison’s critique [1] in the context of the present reply. They may well then come to the
conclusion that our approach did after all merit the description “simple” but that the epithet
“poor” should be attached to Douglas Morrision’s critique.

Our own conclusions

We welcome the fact that Douglas Morrison has decided to publish his criticisms of our work
in the conventional scientific literature rather than relying on the electronic mail, comments to
the press and popular talks; we urge his many correspondees to follow his example. Following
this traditional pattern of publication will ensure that their comments are properly recorded for
future use and that the rights of scientific referees will not be abrogated. Furthermore, it is our
view that a return to this traditional pattern of communication will in due course eliminate the
illogical and hysterical remarks which have been so evident in the messages on the electronic
bulletins and in the scientific tabloid press. If this proves to be the case, we may yet be able to
return to a reasoned discussion of new research. Indeed, critics may decide that the proper
course of inquiry is to address a personal letter to authors of papers in the first place to seek
clarification of inadequately explained sections of publications.

Apart from the general description of stages 1-5, we find that the comments made by Douglas
Morrison are either irrelevant or inaccurate or both.

References

[1] Douglas Morrison, Phys. Lett. A.
[2] M.Fleischmann andd S. Pons, Phys. Lett. A 176 (1993) 1
[3] to be published
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[5] R.H. Wilson, J.W. Bray, P.G. Kosky, H.B. Vakil, and F.G Will, J. Electroanal. Chem.
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[6] M.Fleischmann and S.Pons, J.Electroanal. Chem. 332 (1992) 33
[7] S. Pons and M.Fleischmann in: Final Report to the Utah State Energy Advisory Council,
June 1991.
[8] G. Kreysa, G. Marx, and W.Plieth, J. Electroanal. Chem. 268 (1989)659
[9] M. Fleischmann and S. Pons, J. Electroanal. Chem. 261 (1989)301
[10] W.Hansen, Report to the Utah State Fusion Energy Council on the Analysis of Selected
Pons-Fleischmann Calorimetric Data, in: “The Science of Cold Fusion”: Proc. Second
Annual Conf. on Cold Fusion, Como, Italy, 29 June-4 July 1991, eds T. Bressani, E. del
Guidice and G. Preparata, Vol 33 of the Conference Proceedings of the Italian Physical
Society (Bologna, 1992) p491; ISBN-887794–045-X
[11] T. Droege: private communication to Douglas Morrison.
[12] W.H. Press, B.P. Flannery, S.A. Teukolsky, and W.T. Vetterling, “Numerical Recipes”,
Cambridge University Press, Cambridge, 1989.
[13] M.Fleischmann and S. Pons “Frontiers of Cold Fusion” ed. H. Ikegami, Universal
Academy Press Inc., Tokyo, 1993, p47; ISBN 4-946-443-12-6