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All 16-mm. statics should be equipped with a monitor and probably are, but other film users who have made a projectionroom for themselves will also find it of considerable value.
It can easily be wired, in series, with any existing loudspeaker, though you must ensure that it is of similar impedance and voltage. If you are thinking of buying a monitor, have it fitted and working to your satisfaction before concluding the deal.
Continuous Projection
This relates to the use of special equipment enabling a complete programme to be run through a single projector without a break. The entire programme is joined together and wound upon a giant spool, and a separate motor may be incorporated for handling the extra strain on the take-up.
These continuous-projection devices have much to be said in their favour, but before using such equipment, first ask your film librarian if there is any objection to you using it with his films. It is also a good idea to ask the library which type they recommend if you are thinking of buying one, which will ensure that there will be no objection when you begin to use it.
It is quite possible, however, that you may have heard of a method of giving continuous shows with one projector without using any special apparatus. If you do know how it can be done, please remember that it is not permitted when using library films. The only way in which you can give a continuous show with one projector is by using the special equipment mentioned. If other methods could be adopted without raising a storm of protest, you would read about them here.
Arc Projection — 16-mm. Only
A number of professional 16-mm. arc projectors have now made their appearance and a few words on their use can be included in this book.
An arc lamp basically consists of two rods of carbon, fed by an electric current.
The term "trim the lamp" means inserting new carbons or aligning those already in the lamphouse. "Striking the arc", which means switching them on, entails bringing their tips together and then separating them to form a small gap of predetermined width. The carbon points then begin to burn and produce a powerful concentrated light.
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