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416 MOTION PICTURE HANDBOOK
CHEAP EQUIPMENT
As a general proposition it may be said that cheap equipment is very expensive equipment in the end. Except where the use is strictly temporary it seldom or never pays to buy cheap projection apparatus.
The wise manager will keep constantly before him the fact that his energies should be directed first and foremost to the bringing in of every possible penny at the box office, and that if a three hundred dollar projector will, by the added excellence of projection, bring in an added box office revenue of even so much as three dollars per week, as against a projector costing two hundred dollars, then the high-priced machine is emphatically the best investment. He must bear in mind the fact that if one of the lenses is producing poor results, those results will operate to send patronage to some rival house, hence it should be replaced immediately. He should not for one instant forget the fact that his audience pays an admission to his house to see what is spread forth upon his screen, and that the more excellent the performance, the more people 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 average revenue of let us say forty dollars per week, then the thirty dollar operator and the three hundred dollar projector is a good investment. And if the average increased revenue amounts up to fifty or to seventy-five 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 of hydrofluoric acid.