Bauhaus-Universität Weimar

Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine
Gage, Henry Simon and Henry Phelps Gage
[Ch. VIII 
Any one who can make a good negative and a good paper print 
from it can make a good lantern slide. The lantern slide is a 
positive and the lights and shades should appear as in the object 
when one looks through the slide toward the light. These lantern 
slides arc small transparencies, and some of them make beautiful 
ornaments when used as transparencies in a window. 
There is more danger of getting the slides too opaque than not 
opaque enough. The beginner should try each lantern slide with 
Fig. 117. Copying, Enlarging or Reducing Camera. 
(From the Catalogue of Anthony & Co.). 
O The objective. The bellows have been cut away to show it. 
/ Front of the camera with frames or “kits" for negatives of various sizes. 
For making enlargements with this camera the objective can be placed in the 
a moderate light in the lantern. If the picture on the screen is 
brilliant and shows all the details with the moderate light, it will, 
of course, give a more brilliant picture with the electric light of 
3000 to 4000 candle-power. If the slide is too opaque, it will not 
come out well with the moderate light and, while the powerful 
electric light may show it fairly well, so much radiation will be 
absorbed and transformed into heat that the slide is liable to break 
if left in the lantern a considerable time. The more transparent 
slides allow the radiant energy' to pass through them and naturally 
they are not so greatly heated.


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