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390 CINEMATOGRAPHIC ANNUAL
POLISH FOR CAMERAS, WOODWORK, ETC.
Linseed Oil 20 ounces 400 cc.
Spirits of Camphor 2 ounces 40 cc.
Vinegar 4 ounces 80 cc.
Butter of Antimony 1 ounce 20 grams.
Liquid Ammonia !4 ounce 5 cc.
Water }4 ounce 5 cc.
Apply very sparingly with a bit of old flannel, and rub off thoroughly with soft rags.
BLACKENING BRASS WORK.
A. Copper Nitrate 200 grs 450 grams.
Water 1 ounce 1000 cc.
B. Silver Nitrate 200 grs 450 grams.
Water 1 ounce—. lOOOcc.
Mix A and B, and place the brass work (perfectly cleaned) in the solution for a few moments, heating on removal.
VARNISH FOR BRASS WORK
Celluloid 10 grs 4 grams.
Amyl Alcohol Yi ounce 1 00 cc.
Acetone 1/2 ounce 100 cc.
Commercial "cold lacquer" may also be used for this purpose.
TO BLACKEN ALUMINUM Clean thoroughly with fine emery powder, wash well, and immerse in:
Ferrous Sulphate 1 ounce 80 grams.
White Arsenic 1 ounce 80 grams.
Hydrochloric Acid 12 ounces 1000 cc.
Dissolve and add:
Water 12 ounces 1000 cc.
When the color is deep enough, dry off with fine sawdust, and lacquer.
SILVERING MIRRORS.
A. Silver Nitrate 175 grs -_ 40 grams.
Distilled Water 10 ounce 1000 cc.
B. Ammonium Nitrate 262 ounces 60 grams.
Distilled Water 10 1000 cc.
C. Pure Caustic Potash 1 100 grams.
Distilled Water 10 1000 cc.
D. Pure Sugar Candy Vi 100 grams.
Distilled Water 5' 1000 cc.
Dissolve and add:
Tartaric Acid 50 grs 23 grams.
Boil in flash for 10 minutes, and when cool add:
Alcohol 1 ounce "_ 200 cc.
For use, take equal parts of A and B. Mix together also equal parts of C and D — mixing in another measure. Then mix both of these two mixtures together in the silvering vessel, and suspend the mirror face downward in the solution.
THERMOMETRIC TABLES
For converting temperature readings by one system into those of any other system, these rules will be found useful. Centigrade (Celsius) to Fahrenheit :
Multiply degrees C. by 9, divide by 5, then add 3 2. Centigrade to Reaumur:
Multiply degrees C. by 4 and divide by 5. Fahrenheit to Centegrade (Celsius) :
Subtract 32 from Fahrenheit reading; multiply by 5 and divide by 9. Fahrenheit to Reaumur:
Subtract 32, divide by 9, multiply by 4. Reaumur to Centigrade (Celsius) :
Multiply by 5 and divide by 4. Reaumur to Fahrenheit:
Multiply by 9, divide by 4, add 32.