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.
and forefinger, without being visible upon the screen, 
as is sometimes the case with the square slide. Then 
again, it is easier to place in its proper position (right 
side up), having only one chance of error instead of 
In considering the dry process, it is hut proper to 
say that a large number of different formules have been 
published; in fact, scarcely half a dozen photographers 
think alike on thi3 subject. It is, therefore, impossible 
to give a formula that will give universal satisfaction. 
In preparing this paper for publication, it must be dis¬ 
tinctly understood that nothing new in the way of pre¬ 
servative or development is claimed; it is simply one of 
the many methods for preparing dry plates that has 
given reliable results. 
The dry-plate photographer must be prepared for 
many and great failures, and bo possessed of the greatest 
amount of patience and nicety of manipulation, for other¬ 
wise time is wasted, and the best process voted a failure. 
Commence with reliable chemicals, and follow up the 
process with a lavish expenditure of water when wash¬ 
ing is mentioned, not only on the collodion plate, but 
thoroughly rinse the various glasses and dishes, and 
particularly the fingers, between each operation. Uso 
as little light as possible when making or developing 
dry plates, and he careful that the light is yellow. 
Probably more dry plates are ruined, and the par¬ 
ticular process used condemned as worthless; by the use 
* I am greatly indebted to my triend, Mr. E. Wallace, Jr., for bis kindness 
in furnishing me with the formula, and showing, by his own experiments, the 
valuable results to be obtainod from this process. J. C. Browne.


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