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.
copied in proper position in front of the lens, with noth¬ 
ing to shut off the diffused light between the lens and 
In selecting a position for operations, a north light 
will he found the best suited for the purpose. The 
upper window sash should be lowered, and the board 
upon which the cameras are arranged rested one end 
upon a table, the other upon the lowered sash, so that 
the negative will have the sky for a background. This 
is easily determined by focusing upon the ground-glass. 
It is advisable not to allow the direct rays of the sun to 
illuminate the negative. Should a north light not be 
obtainable, cover a frame with white tissue-paper, and 
let that be the background for the negative. The tis¬ 
sue-paper can be illuminated with the sun’s rays, or by 
any artificial light. 
It may seem to the reading photographer, unneces¬ 
sary to burden this article with a complete chemical 
formula for making glass positives, but a3 it is prepared 
expressly for the uninitiated, it would be unintelligible 
without a formula. 
To make 8-oz. Sensitive Collodion.—Alcohol 5 oz., ether 
3 oz., iodide of ammonium 44 grs., bromide of magnesi¬ 
um 20 grs., cotton (Parys’) 35 grs. Before using, filter 
several times through cotton soaked in alcohol. It is a 
good plan to keep a supply of plain, unexcited collodion 
on hand, as a stock-bottle ; also, a bottle of exciting solu¬ 
tion, made in the proportion of iodide of ammonium 5 
grains, bromide of ammonium 2\ grains, to the drachm 
of alcohol. By adding 1 drachm of the solution to 1 
ounce of plain collodion, it will be excited to the proper 
Nitrate Solution.—Water 1 ounce, nitrate of silver 40 
grains; make slightly acid with nitric acid, C. P. Iodize


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