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connected to the projector's amplifier, thus permitting commentaries, recorded or otherwise, to be made during the screening of silent films, etc. (The jackplug is a i-pin plug of the type used chiefly on telephone exchange-boards).
When inserted, the plug may automatically cut out film-sound, thus allowing you to change over from film-sound to mike or non-sync merely by using the plug alone. You must find out whether this is so or not because, in the case of you being able to use the non-sync (with the projector running) without automatically or otherwise cutting out film-sound, there arises the possibility of trouble when using the non-sync with a silent film.
Just imagine for a moment that you are about to use a silent film on a sound projector and also that you are going to use the non-sync or the mike during the performance. Naturally, the first thing you do is to switch on the projector's amplifier, which in most cases means that the exciter will be switched on as well. Now if the exciter lamp cannot be switched off while you are using the amplifier, then the exciter will excite the photo-electric cell via the perforations in the silent film and the nasty noise you then hear from the loudspeaker will be one of 16 cycles per second! (16 frames or perforations per second for 16-mm.).
You are quite likely to experience this trouble should you be foolish enough to include a silent film in a programme of sound films, and if you are unable to switch off the exciter or in some way interrupt its rays there will be nothing else to do but remove the exciter itself. But can you switch over from sound to silent speeds without stopping the motor? This is something else which must be checked in your operators' instructions.
The mike intended to be used with a sound projector must also be a perfect match and before buying one it is always preferable first to approach the makers of the projector to see if they can supply one, or at least tell you the type to get. Do not make the mistake of thinking that any microphone can be used on your equipment.
Using Microphones
When in use, the mike should be held at a distance of about six inches in front of and facing your mouth. (We are talking about the type supplied with projectors) . Holding the mike on one side or practically mouthing into it is seldom necessary.
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