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328 HANDBOOK OF PROJECTION FOR
heat, and where a wire which is working close to capacity electrically is subjected to the action of heat from an outside source, the effect is to raise the resistance of the wire, thus lowering its carrying capacity and setting up still more heat and rapid oxidization and deterioration. In a very short time the strands of the asbestos wire inside the lamp house turn brown, then dark brown.
If you strip back the insulation you will probably find the wire to be discolored for a considerable distance. Under this condition its resistance is very high, and since resistance means loss which is registered on the meter, the wire is consuming within itself, by reason of its high resistance, wattage which in a few hours' time will more than equal the cost of the wire, modified, of course, by the fact that if current is taken through an adjustable rheostat there may be no actual loss, as that much less resistance will be required in the rheostat. But the condition is a bad one nevertheless.
Yet it is a fact that many theatre managers, lacking knowledge of such matters themselves, and unwilling to trust the knowledge of their projectionist, protest against the cutting off of burned wire, and demand that it be used longer. They are "saving" a few cents in wiring deplacement at the expense of a great many cents in electrical energy.
There is always a tendency to use the intermittent sprocket of the projection machine too long, with consequent damage to the film and to the screen result, and anything which damages the screen result is expensive, because the public patronizes a theatre in proportion to the pleasure it gets out of what it sees on the screen.
I mention these two examples merely as being typical, and place them in evidence as showing that it does not pay to be too economical in the matter of projection room supplies ; also as proof that lack of knowledge often causes a theatre manager to practice that which is in fact false economy; in other words to practice economy which is as a matter of fact not economy at all, but exactly the opposite.
It is the part of wisdom for the theatre manager to employ only projectionists in whose ability he has at least a reasonable amount of confidence, and having done so to allow them a reasonably free hand in the matter of projection room supplies.
As a matter of business the theatre manager may very