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1950-51 Theatre Catalog, 9th Edition, Page 362 (340)

1950-51 Theatre Catalog, 9th Edition
1950-51 Theatre Catalog
1950-51 Theatre Catalog, 9th Edition, Page 362
Page 362


1950-51 Theatre Catalog, 9th Edition, Page 362

75 TO 130 AMPERE HIGH INTENSITY REFLECTOR TYPE PROJECTION ARC LAMP



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When pictures are projected by National Excelite lamps you can SEE the difference 7- for they are much more brilliant regardless of screen size.

Forced air cooling of the rotating positive carbon feeding mechanism assures low operating temperatures.

The positive arc crater is automatically maintained at the exact focal point of the 161/2" elliptical reflector. This big reflector has an optical speed of f:1.9 to match the modern f:1.9 projection lens. The reflector holder and adjustment devices are an integral part of the rear door.

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The Excelite burns a 9 mm x 20" high intensity positive with a 5/16" x 9" copper coated negative at 75 to 90 amperes. A bi-metal electronic tube automatically governs the speed of the separate motors which advance the positive and negative carbons.

Stable burning and complete combustion at the arc to avoid any black soot are attained by a jet of air directed just above the arc. White smoke, which would otherwise cloud the mirror, is also directed away from the reflector by this air stream.

Unit construction permits instant removal of the various components for cleaning and inspection.



Equipmenl 8 Supplies For Every Theane Need

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THEATRE CATALOG 1950-51
1950-51 Theatre Catalog, 9th Edition, Page 362