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Technical Section.
225
Data for Kinematograph Technicians.
AN ALL-ROUND DEVELOPER FOR TOPICALS. NEGATIVES AND POSITIVES.)
Metol 3 oz., Hydroquinone 1 lb., Pot. Metabisnlphite 2 oz., Citric Acid 2 oz., Pot. Bromide J oz., Soda Sulphite (cryst.) 4 lb., Soda Carbonate (cryst.) 2 lb., Water 65 pints.
Developing temperature 65 to 75 F. (The warmer temperature only
in the case of under-exposed negatives.) This bath is extremely quick
working, development being complete in 2 to 3 minutes. — (From " The Handbook of Kinematography.")
TO KEEP LENS GLASSES FROM STEAMING.
Rub on them lightly a very little spermaceti wax, and polish it off well with a clean dry silk rag. A better way is to dissolve the wax in a small quantity of benzine, drop a single drop of the benzine-wax solution on a clean silk and with the silk proceed to polish over the lens glass. The polished glass must not show any visible trace of wax upon its surface, or the definition of the picture thrown by the lens will be injured.
A FINE SURFACE FOR SCRATCH-IN ANNOUNCEMENTS.
Mix together equal parts of artists' liquid Indian ink and strong liquid gum arabic. Clean 3 \ by 3 \ glass plates thoroughly, first in soda solution, then under the tap, dry them without touching the surface with the fingers, and coat one side of each with the Indian ink-gum mixture till it is just opaque. Allow to dry naturally. The prepared announcement slides may afterwards be stored indefinitely. Before writing on them with the needle or graver, breathe over the surface, and the finest lines may then be put in without a suspicion of flaking.
ORDINARY FILM CEMENT.
Amyl Acetate 4 oz., Acetone 6 oz.
This may either be used as it is, in which case the cement will be a thin fluid with not much more body in it than water, or it may be thickened to any desired extent by dissolving it in celluloid chips. Celluloid film base from which the gelatine coating has been cleaned off will serve.
A RECOMMENDED FORMULA FOR NON-FLAM FILM CEMENT.
(From " The Guide to Kinematography.") Cellulose Acetate 1 oz., Acetone 14 oz., Amyl .Acetate 1% oz., Xycl 3 oz. Non-flam film varies so much according to the maker that it is impossible
to say, without trial, which of the three above formulae will be most suitable
in any particular user's hands.
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