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A PARALLEL OF 1C AND 35 MM. FILMS
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do not form a solid mass of light necessitates that the reflector back of the lamp be susceptible of being adjusted, so that the image of the lamp filaments formed by the reflector can be made to enmesh the image of the same filament formed by the condenser and evenly cover the film aperture.
LAMP
FILM
AXIS
PROJECTORS APERTURE
AXIS'
Fig. 5. Optical system of the FILMO Projector.
It is well to mention here that the Kodacolor system of 16 millimeter color films demands good care in the adjustment of the whole optical system and as perfect as possible enmeshing of the images of the lamp filaments.
Incidentally, this color process whicb is available only in 16 millimeter demands also as great a source of light as possible.
This is due to the fact that the colored filter absorbs a good amount of light, resulting in that the size of the screen image is limited mainly by the flux of light available.
A 3 75 -watt lamp permits a good Kodacolor projection on a 30"x40" screen.
Although the incandescent lamps used in 16 millimeter projection are eminently efficient, it is quite advisable that the screen upon which the pictures are projected offer a greater reflective power than those used in public auditoriums for professional films.
This is especially true of 16 millimetei films used for educational and industrial purposes, which are shown to a relatively great number of people at once.
In theatres, it has been found that it was even possible to perforate the screen with a great number of small orifices to permit a free transmission of sound (the speakers being placed behind the