Bauhaus-Universität Weimar

The Sciopticon Manual, Explaining Lantern Projections in General and the Sciopticon Apparatus in Particular Including Magic Lantern Attachments, Experiments, Novelties, Colored and Photo-Transparencies, Mechanical Movements, etc.
Marcy, L. J.
flame to get intensity from a single point. A narrow 
strip of glass sets into this slit as between two lips. The 
thickness of the flame gives the horizontal diameter of 
the point of light. Only the front of the lamp is shown 
at the right of Fig. 24, but it can be seen how the light 
from the whole width of the flame reaches the printing- 
frame through the narrow aperture. 
At the left, we see how the negative is held over the 
opening in the frame by four springs ; the long spring 
on the opposite side holds the sensitive plate in the 
The operator, standing on the opposite side, with the 
upper corners of a quarter plate, just from the bath, 
between his thumb and finger, and shading off direct 
rays with his left hand, places it in its silver bearings j 
this brings the two films almost in contact. 
The lamp and frame stand from 16 to 26 inches apart, 
or so far as to require about two minutes for the print¬ 
ing, or the time it takes for a round of the other manipu¬ 
lations and changes; so a picture is finished and dropped 
into grooves in a trough of water as often as one has 
had time to print. 
All that is said in the previous article on the wet- 
plate process, in regard to development, &c., applies 
here. Any drops of silver bath that may have come in 
contact with the negative must be washed off before it 
is put away. 
Like dry-plate printing, the negative must be of the 
exact size required for the lantern slide. 
Some of the advantages of this method are : 
1. It can be practiced evenings or in cloudy weather. 
2. The light is inexpensive. 
3. Plate glass is not a necessity. 


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