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1948-49 Theatre Catalog, 7th Edition, Page 432 (419)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 432
Page 432


1948-49 Theatre Catalog, 7th Edition, Page 432

HEREIS THE INCREASED LIGHT YOUiVE WANTED FOR

DRIVE-IN & LARGE INDOOR SCREENS

THE

NEW

MOTIOGRAPH-HALL

75/115 AMPERE

HIGH INTENSITY

REFLECTOR TYPE ARC

Operating at 85 amperes, the Motiograph-Hall producas 19,000 lumens-more light than condenser-type high intensity lamps operating at more than twice this amperage.

Precise positioning of the carbons with respect to each other holds the gases within 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 amperes.

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 reHector-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,

LAMP



if any, more reaches the screen than is obtained from a lesser

light source.

Due to the extremely high intrinsic brilliancy of the MotiographHall 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 auto-.

matically corrects the gap length. Constant adjustment of manual

controls is unnecessary.

The Motiograph-Hall 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 Motiogroph products include Motiogroph 1 KW. and 46-ompere

LITERATURE AND COMPLETE

high intensity or: lamps, Motiogroph proiectors. indoor and outdoor sound

INFORMATION MA Y BE

systems. generators and rectiners. in-cor speaker equipment and iunction

OBTAINED FROM

boxes. romp switching panels for drive-ins. turntables. etc.



"In" 4431 W. LAKE ST., CHICAGO 24, ILL.

1948-49 THEATRE CATALOG

(In lilll/I/xllt' HH/llH'] 1'; [I'm rI/mmu [I/mln turn/i011 1/in 1n/I/Im and #11er number.
1948-49 Theatre Catalog, 7th Edition, Page 432