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668 MOTION PICTURE HANDBOOK
number of people who will pay admission — hence the greater will be the revenue of the house.
If an experienced thirty-dollar-a-week operator, working with a three-hundred-dollar projector, can produce results sufficiently superior to those produced by the fifteen dollar operator working with a two hundred dollar projector to bring in an added revenue of, say, even twenty dollars per week, then the thirty-dollar operator and the three-hundreddollar projector is a good investment. And if the average increased revenue amounts to as much as thirty or more dollars per week (not at all impossible, or even improbable) then the high-priced outfit is indeed a splendid investment.
COLORING INCANDESCENT LAMPS
It is often desirable to color incandescent globes. Red lamps are needed for exit lights and red, blue and green are used for stage effects. To produce the desired colors dissolve one ounce of refined gelatine in one pint of water, and, after bringing it to a boil, add an aniline dye (Diamond dyes are excellent for the purpose), of the color desired, in sufficient quantity to make the liquid very dense in color. Dip the lamps in the solution while it is hot, and after removal let them dry as quickly as possible. Repeated dippings and dryings will make the color on the globe more dense. The lamp may then be dipped in a thin brass lacquer, or, better yet, in formaldehyde, which will render the color waterproof. Incandescent globes may be frosted by dipping them in a strong solution or hydrofluoric acid.
A WARNING
Those who contemplate the erection of new theatres or the remodeling of an old one should be very careful about leaving the location and planning of the operation room entirely to the architect; also it is not wise to leave the selection of a screen or other projection equipment to his judgment.
Consider the question for a moment. No matter how thoroughly competent an architect may be as to the planning of buildings, by no means does it follow that he has competent knowledge of the requirements of practical projection.
As a matter of fact some of the very best architects in the country have\ perpetrated the most atrocious blunders imaginable in operating room construction and location.
It is also, except in isolated cases, where an operator of ex