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MOTION PICTURE PHOTOGRAPHY
Dissolve and add
Tartaric acid 50 grs 23 gms.
Boil in flask for ten minutes, and when cool add
Alcohol 1 oz 200 c.cs.
Distilled water, quantity sufficient of make up to 10 ozs. or 2000 c.cs.
For use, take equal parts of A and B. Mix together also equal parts of C and D and mix in another measure. Then mix both these mixtures together in the silvering vessel, and suspend the mirror face downward in the solution.
Thermometry Rules
The following rules for the rapid conversion of degrees in one system into another will be found useful:
To convert Centigrade into Fahrenheit:
Degrees centigrade times 9 divided by 5 plus 32.
Ex. — 8o° C. times 9 divided by 5 equals 144 plus 32 equals 1760 F.
To convert Centigrade into Reaumur:
Degrees Centigrade times 4 divided by 5.
Ex. — 6o° C. times 4 divided by 5 equals 480 R.
To convert Fahrenheit into Centigrade:
(Degrees Fahrenheit minus 32) times 5 divided by 9.
Ex. — ioo° F. minus 32 equals 68 times 5 divided by 9 equals
37-8° C.
To convert Fahrenheit into Reaumur :
(Degrees Fahrenheit minus 32) divided by 9 times 4.
Ex. — 950 F. minus 32 equals 63 divided by 9 times 4 equals 2S0 R.
To convert Reaumur into Centigrade.
Degrees Reaumur times 5 divided by 4.
Ex. — 8o° R. times 5 divided by 4 equals ioo° C.
To convert Reaumur into Fahrenheit.
Degrees Reaumur times 9 divided by 4 plus 32.
Ex. — 1 6° R. times 9 divided by 4 equals 36 plus 32 equals 68° F.
Depth of Field
Depth of field is governed by angular aperture, which is a measure of the angle at the apex of the cone of light reaching
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