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of projectors lined up for my inspection, what should I look for and what should I guard against}
A. The first thing to do is to find out your exact requirements, such as the average size of your audience, the size of the hall or room to be used, the size of the screen, and the length of throw. Assuming that your audience numbers about 400, you should use a 6' or 8' screen, a projector having a lamp of about 500-watts, and a lens of about 2" focal length (16-mm.). When you have worked all this out you can then go along and look at the machines. Some of the things to look for are as follows : —
That the projector lamp has a slightly higher wattage than your requirements demand.
That the projector may be used on the electricity supplied in your district. (Check the voltage and whether it is A.C. or D.C.)
That you choose, if possible, the projector having the quietestrunning mechanism.
That the spool arms are sufficiently long for the spools you will use (400', 800', 1,600', etc.). Do not choose a projector with arms for 400' spools if you have to use it for a number of 1,600' films.
That the standard projection lens supplied with the projector is of the right focal length. If necessary, ask for the lens to be changed before you make the purchase.
That it has the necessary attachments or is adaptable to your secondary requirements, such as the showing of single frames, or having inputs for mike or gram.
That it is fully demonstrated, and sold with a guarantee of its worthiness.
(There are many other points to watch — points which will become clear to the reader in succeeding chapters. But important is the admonition — never buy a secondhand machine unless accompanied by an expert.)
Q. I have a silent projector which I want converted to sound. Can you tell me where I can find someone to take on the job?
A. Yes, but before I tell you I must ask whether your machine is worth converting or not. There are only a few pre-war models worth the expense, and unless your projector is a really good sturdy one you are advised to forget about it. The conversion usually consists of a sound-head, amplifier, longer spool-arms, projector case (blimp) with carrying handles, loud-speaker fitted
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