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266 RICHARDSON'S BLUEBOOK OF PROJECTION
meters and other controlling gadgets in diminutive form. All meters should be big enough to be plainly visible and should be placed on a panel board located immediately beside the observation ports within easy view of the projectionist. Their dials should be dead black in color (non-gloss) ; the figures, division marks and needles in white.
What Constitutes a Good Projection Room
(93) The following qualities are essential to any comfortable, well-planned projection room:
Located so that a point midway between the two motion picture projector lenses will be equi-distant from a line at right angles to the screen center.
So located, as to vertical height, that distortion will not increase picture height in excess of five per cent of normal height.
So located that the projection lens E.F. will not exceed four and a half inches E. F. minimum and seven inches E. F. maximum.
Thoroughly fireproof so as to confine fire within its own walls.
All port shutters capable of closing automatically within three seconds of inception of fire at either the projector aperture, film storage reservoir or rewinder.
Port fire shutters to allow either instantaneous manual or automatic operation.
Provision to pump out smoke and gases rapidly enough to maintain a slight vacuum in the room, so that no smoke escapes through crevices into the auditorium.
The floor must be wholly vibrationless.
All illumination to be behind the projectionist as he stands beside the projectors.
No light to be openly visible except when direct light is necessary in case of trouble.
There should be a separate light circuit for brilliantly lighting the room in time of trouble, and one or more reel-lights for use in working around machinery. The front wall should be painted flat black. Next in efficiency