Some account of Photogenic Drawing or, the process of which Natural Objects may be made to delineate themselves, without the aid of the Artist's Pencil by Henry Fox Talbot Esq. FRS

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                                as possible. Sometimes the spots are of a 
pale tint of caerulean blue, & are surrounded 
by exceedingly definite outlines of perfect whiteness 
contrasting very much with the blackness of the 
part immediately succeeding.
With regard to the theory of this, I am only 
prepared to state as my opinion at present 
that it is a case of what is called “unstable 
equilibrium “. The process followed is such as 
to produce one of two definite chemical compounds;
& when are happen to come near the limit 
which separates the two cases, it depends 
upon exceedingly small & often imperceptible 
circumstances, which of the two compounds 
shall be formed.
That they are both definite compounds,
is of course at present, merely my conjecture:-
that they are signally different is evident 
from their dissimilar properties.
I have thus endeavoured to give a 
brief outline of some of the peculiarities 
attending this new process, which I offer 
to the lovers of science & Nature.
That it is susceptible of 
great 
                            
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Manuscript details

Author
Henry Fox Talbot
Reference
AP/23/19
Series
AP
Date
1839
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Some account of Photogenic Drawing or, the process of which Natural Objects may be made to delineate themselves, without the aid of the Artist's Pencil by Henry Fox Talbot Esq. FRS, 1839. From The Royal Society, AP/23/19

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