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If it produces from the loudspeaker a howl like a banshee in torment, you are either too near with it to the projector or speaker, or the volume is at too high a level.
Lots of fun can be had with the mike, but for all public occasions its use should be rehearsed prior to the performance. You must note beforehand the volume setting which will be required by the person using it, and you must not allow it to reproduce unwanted sounds.
The volume control should be adjusted only a moment or two before the person begins to speak and you must be ready to lower the volume momentarily should you see him about to cough or sneeze. As soon as he has finished speaking, lower the volume. Never allow the mike to be placed on a table before the volume has been lowered, otherwise the audience may be startled as though by a minor explosion.
Another unnecessary habit is that of testing the microphone by knocking it with your knuckles. That sort of treatment can quite easily cause a lot of damage, especially with ' 'crystal' ' mikes. The correct way to test it is by speaking into it, normally.
Rewinders
Some projectors are fitted with a rewinding device, but if this is absent a special rewinder will be required. A simple one may be made by mounting two spool-arms in an upright position upon a smooth board, and providing the righthand arm with a winding-handle, preferably geared. There are many rewinders to choose from on the market, and some incorporate illuminated viewing-panels and splicers. Many, of course, are highly geared, but this last is a doubtful attraction, for rewinding should never be done at high speed.
Always keep the rewinder greased or oiled, and any checking or tensioning-device correctly adjusted. If there is no such device on your rewinder then you should lightly check the feedspool by hand when using it. This will prevent the film jumping should the feed-spool tend to race the take-up spool. And, of course, make sure that the spools are not likely to fly off the rewinder.
The spool-arms should also be kept correctly aligned and stable.
The size and shape of rewinder spindles are similar to those
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