200 C. A. Joy on the Chimenti Pictures. 
that the pictures were not stereoscopic ; and Dr. W. B. Carpenter, 
being of the same opinion, charged Sir David Brewster publicly 
with dishonesty, in not having retracted his opinion of them, 
alleging that he must have known that they were not stereo- 
scopic from copies in his possession. Sir David never saw the 
pictures till March 7, 1862, when he received a photograph of 
them from Professor Kuhlemann, of Lille, and found them to be 
truly stereoscopic! Mr. Wheatstone and Dr. Carpenter apparently 
not knowing that they should be transposed when placed in the 
stereoscope, though this is distinctly shown in Dr. Brown's com- 
munication.” 
The authorship of the above history of the Chimenti pictures 
is usually attributed to Sir David Brewster. 
Prof. Emerson, in the following note, has again called my at- 
tention to these prints, being impelled thereto by an article from 
Sir David Brewster in the Philosophical Magazine: 
: “ Panis, Feb. 24, 1864. — 
: s I know your lively interest in such matters, you 
will probably have noticed a letter of Sir David Brewster in the Philo 
sophical Magazine for January, 1864, in which he controverts the con- 
clusion I draw from my investigations of the Chimenti Pictures.” It 1s 
thoroughly and exhaustively. 
am very sincerely yours, Epwin Emersoy.” 
In compliance with Professor Emerson’s request, I have been 
at some pains to obtain American testimony on the matter 10 
aces: 
hree sets of the Chimenti pictures were pasted on stere0- 
scopic cards. ‘The first set was mounted correctly according 1 
Sir David Brewster; the second, as they were found, that 15) 
wrong, according to Sir David; on the third, two prints 
the sarfie negative were placed side by side. These prints were 
sent to persons familiar with the use of the stereoscope, and 4 
large amount of testimony was obtained. Truth compels me t 
say that not a solitary person found them to be “truly stere? 
copic. 
__ A few observers imagined that they saw some slight — 
but as they pronounced the relief to be best where the right and 
left hand prints were from the same negative, their testimo?. 
was unfavorable to Sir David Brewster. 
SS eile Joma, Bov. 10st. 
