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£-10 SHOWMEN'S TRADE REVIEW, February 5, 1949
HERE'S THE INCREASED LIGHT
YOU'VE WANTED FOR
DRIVE-IN & LARGE INDOOR SCREENS
mm
m
Operating at 85 amperes, the Motiograph-Hall produces 19,000 lumens — more light than con-denser-type high intensity lamps operating at more than twice this amperage.
Precise positioning of the carbons with respect to each other holds the gases witjiin the crater where they become superheated to extreme brilliancy. A rotating positive carbon (the only reflector-type lamp with this feature) permits even burning of the carbons and a proper crater form, at 75 to 115 amiperes.
The efficiency of the reflector-system in collecting and focusing the light on the picture aperture is admittedly superior to that of the condenser-type lamps. Employs a 16" mirror, the largest of any reflector-type lamp. The reflector holder is permanently mounted so as to form the rear door of the lamphouse, rendering perfect optical alignment of the reflector, aperture and lens at all times.
Some lamps require a glass heat filter between the lamp and the projector to prevent film buckling. These filters, however, also reduce the amount of visible light passed
so that little, if any, more reaches the screen than is obtained from a lesser light source.
Due to the extremely high intrinsic brilliancy of the Motiograph-Hall arc, the total light output contains a much larger percentage of visible light, making the use of a filter unnecessary.
The automatic focus control, an exclusive feature, constantly holds the crater of the positive carbon at the exact focal point of the mirror, preventing variations in the character of the light at the screen.
When the current approaches 2% above normal or falls to 1% below normal, a pilot light flashes and the arc control automatically corrects the gap length. Constant adjustment of manual controls is unnecessary.
The Motiograph-iHall lamp is designed to use 9 mm. or 11 mm. high intensity positive carbons and 5/16" negative carbons, the cost of which is about one-third that of the cost of the larger carbons used in condenser-type lamps operating in the 140-180 ampere range.
Other Motiograph products include Motiograph 1 K.W. and 46-anipere high intensity arc lamps, Motiograph projectors, indoor and outdoor sound systems, generators and rectifiers, in-car speaker equipment and junction boxes, ramp switching panels for drive-ins, turntables, etc.
Literature and complete information may be obtained from
moTioGRAPH, inc., 4431 W. LAKE ST., CHICAGO 24, ILL.