Referee report by T. R. Robinson on 'On the Spectra of Ignited Gases and Vapours, with Especial Regard to the Different Spectra of the Same Elementary Gaseous Substance' by J. Plücker and J. Hittorf

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                                Nor does another statement seem more probable 
that certain lines which occur in the spectrum 
of Arsenic vapour while moderately heated, but 
disappear at high temperatures, are due to mer =
cury which he supposes to be <u>always<\u> present in that 
metal. It is far more likely that that these lines are 
common to both metals.
He refers the difference of his two sets of spectra 
to the difference of temperature of the Electric discharge; but in 
doing so I think he seems to no very clear concep =
tion of the laws by which that temperature is regulated,
and to overlook the peculiar character of the Induced Coils 
action, and the nature of its spark. The theory of the 
Coil is as yet so imperfect that we cannot tell how a res =
istance in its Circuit affects the quantity of Electrici 
ty which it discharges; and he seems to ignore the 
difference between the Leyden discharge and the simple 
spark. The former is instantaneous, the other not 
for its Envelope (which you have compared to the Voltaic 
arc) has a sensible duration. All the spectra of rarified 
gas which I have examined with the Revolving mirror 
have this permanence. How this modifies the heating 
power of the discharge, it will not be easy to determine.
These however are mere blemishes on a great work 
which its author will himself correct, (as he has here done some 
errors in his former spectral papers) or which will be rectified 
by the experimental discussion that they were likely to produce:
but they in no wise diminish the sterling worth of the rest. I
think it right to point them out to the Council, but at the 
same time have not the slightest hesitation in strong =
ly recommending the paper for publication in the 
Transactions 
yours ever 
T.R. Robinson 
G.G. Stokes Esqr
Secretary of the Royal Society 

1864
Plucker 
by Dr Robinson 

                            
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Manuscript details

Author
Johann Wilhelm Hittorf , Johann Wilhelm Hittorf , Julius Plücker
Reference
RR/5/186
Series
RR
Date
1864
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Referee report by T. R. Robinson on 'On the Spectra of Ignited Gases and Vapours, with Especial Regard to the Different Spectra of the Same Elementary Gaseous Substance' by J. Plücker and J. Hittorf, 1864. From The Royal Society, RR/5/186

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