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not be used on D.C. What you need is a resistance. Ask your local cine dealers to supply you with one to match your projector.
Q. Everybody tells me that I must not use sound films on my silent 16-mm. projector, but as I particularly wish to see some of these films I should be grateful if you could tell me a way out of the difficulty.
A. Sound-film has only one row of perforations, and must therefore be used on a projector with sprocket-wheels having only one row of teeth. The only way out of your difficulty is by replacing all the sprocket-wheels with single-row ones, and by changing the claw movement, either completely or by alteration, so that the claw(s) properly engage the perforations. When the job is finished use a test film and then examine it for scratches and strained perforations, etc., and not until you are absolutely sure that the machine is working satisfactorily should you apply for library films. But the job is really one for an engineer.
Q. We have just finished making the balcony into a first class operating box, and the next thing is to find the right kind of screen. We would like to get the best possible beaded screen obtainable — expense is no object, of course, and we'd like you to fix it up for us. Will you pick out a good beaded screen for us ?
A. Definitely no. But I will help you to get a white or silver one. A beaded screen always reflects the light back towards the source. In your case this would be towards the balcony, and only the operator would see the picture at its best. I must see the hall first before advising you further. (See chapter on Screens.)
Q. All my apparatus, including the projector, is for operating on A.C. mains only. Can you tell me what I have to get for working it on D.C.}
A. You need a rotary converter, but do not forget to obtain one capable of handling the total wattage of all your equipment.
Q. Is it possible to buy a g.^-mm. sound projector}
A. Yes, the Pathescope "Pax" is a good example of one. It has a 400-watt lamp, capacity for 900-foot spools, and ample sound output for use in a small hall.
Q. Where can I obtain a complete description of new equipment as it becomes available}
A. Reviews of all new projectors and accessories are given
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