66 
as far as Mr. Sidebotham has noticed, none of the cameras 
for the purpose are satisfactory or suited for the wants of 
amateurs. 
Mr. Sidebotham then described the little camera which he 
had made for the purpose, and which seemed to answer in 
every way. The principal is to have the negative in front, 
in an adapting frame to slide right and left ; the distance is 
adjustable by two screws; the frame which holds the plate 
also slides right and left, and stops in two places with a drop 
catch, the lens (a short focussed double steresocopic one) 
being in the middle. The camera is adjustable with screws 
for focussing or for enlarging or reducing the image. The 
camera is then tilted towards the sky, the image is focussed, 
and the picture taken on wet collodion, moving the negative 
plate for each half of the picture, developing with iron, and, if 
requisite, deepening or toning with proto-iodide of mercury. 
One focussing and adjustment of the screws will be sufficient, 
and any number of negatives can be copied, if taken with the 
same camera, without any alteration. The negatives require 
no varnishing, so that all their original beauty is there to be 
copied, and it is copied faithfully. Prints by this plan may 
be produced as fast as the plates can be prepared — much 
faster than on paper if a single negative be used, as the 
exposure varies trom five to thirty seconds for each side. 
Mr. Sidebotham stated that much of the beauty of the 
pictures he exhibited were doubtless due to the quality of the 
negatives, and which had been taken by Mr. Buxton, when 
in India last year. Mr. Sidebotham trusted that the plan 
here described would induce amateurs to print their stereo- 
scopic pictures on glass instead of paper, and professionals to 
lower the price of those they place in the market for sale. 
