Bauhaus-Universität Weimar

The Book of the Lantern. Being a Practical Guide to the Working of the Optical (or Magic) Lantern. With Full and Precise Directions for Making and Coloring Lantern Pictures.
Hepworth, T. C.
glass plate, fix it on the pnenmatic holder, hold it level, 
and pour a small pool of emulsion in its centre. By inclin¬ 
ing the plate a little, the pool will run to the two further 
comers, and can afterwards be guided across the whole 
plate with the help of the glass rod. The plate is then 
slid on to the slab, where it will speedily set, and the glass 
rod goes back into th e jug. Each plate is treated in the 
same way until the slab is full, by which time its first 
occupants will have set, and can he reared up to dry in 
shelves, or a proper drying cupboard. The glass chosen 
should be as thin and as free from bubbles as possible, and 
can be of the standard lantern size, 3\ by 3J inches. But 
as experience is gained the operator will find it more con¬ 
venient and economical of time to coat plates by 6| inches, 
which can afterwards be cut across twice with the dia¬ 
mond, to form each four lantern slides. 
My own favourite process for lantern slide making is the 
gelatino-chloride, which has many good points to recom¬ 
mend it. It is suitable only for contact printing, there¬ 
fore the negatives used must be small ones only. Capital 
chloride plates can be purchased nowadays ; but for those 
who prefer to make their own, I can confidently recom¬ 
mend the following formula : Mix up the three solutions 
—A, B, and C. 
. ( Gelatine ..... 
( Water (distilled) 
t, ( Silver Nitrate 
( Water (distilled) 
p { Ammonium Chloride 
\ Water (distilled) 
. 300 grains. 
4 ounces. 
240 grains. 
4 ounces. 
100 grains. 
2 ounces.


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