Movies for TV - Early Television Foundation

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FUNDAMENTALS
Film Camera Multiplexer
16 mm or 35 mm
Mirror
Projector
Film Camera
Iconoscope
Mosaic
Fig. 4-10. Floor layout for two projectors operating with multi-
plexer.
to operate into one camera. The plan view is shown in Figure 4-
10. It will be seen to consist of a pair of mirrors arranged on a
pedestal, one in front of the lens of each film projector. The light
beam from the lens of the projector strikes the mirrors and is re-
flected onto the camera mosaic. The slide projector is mounted
over the mirrors and shines directly into the camera. Merely
switching on one projector and turning off the others is sufficient
to make a change from one to the other.
However, it will be apparent that at times the film will be
longer than can be accommodated on one projector reel, and
therefore it will be necessary to change over between reels. It is,
of course, possible to do this by hand by noticing when the signal
to change over occurs and covering the lens of the old projector
by hand to prevent a double image when the second is
projector
started but it is much easier ;
to use a douser to effect the change-
over.
There are many
kinds of dousers: some are home-made and
consist of a mechanical cap which covers one lens while opening
the other; others are more elaborate and consist of electrical con-