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1954-55 Theatre Catalog, 12th Edition, Page 289 (253)

1954-55 Theatre Catalog, 12th Edition
1954-55 Theatre Catalog
1954-55 Theatre Catalog, 12th Edition, Page 289
Page 289


1954-55 Theatre Catalog, 12th Edition, Page 289

Cartons for the New Systems*

An Analysis of the New Systems9 Demand for More Projection Light, and Some of the Carbons Developed to Meet This Need



BRIEF: With the development and introduction of such things as 3-D . . . and the various wide screen processes . . . in addition to the large number of outdoor theatres . . . there has been a steady demand for more projection light.

This article discusses some of these new systems . . . and how carbons presently available . . . or now under development . . . will answer the exhibitoris need for a brighter picture on a larger screen area . . . In addition. to the material on carbons . . . there is also much of value and interest about the basic problems involved in the presenta tion of some of the newer projection techniques.

*

The attention of theatre owners and projectionists, is now focused on the need for more projection light created by recent developments in the motion picture field*wide screen, 3-D, and outdoor theatres. In some instances projection light requirements have been greatly altered compared with conventional projection, necessitating a complete reappraisal of carbon are light sources and lamp equipment.

A complete summary of the amount of screen illumination obtainable with the popular combinations of lamps, optical systems used for 35mm motion picture projection was published in 1947.";L The years since have been important new developments in all aspects of motion picture projection systems. Hitex;k 13.6mm, super high-intensity carbons were introduced in 1949 for use in rotating-carbon, condenser-type lamps at 170-180 amperes.

Recent months have witnessed the introduction of a new 13.6mm standard high-intensity carbon to replace the former one used in condenser-type lamps at 125-150 amperes, A new Suprex* 9mm positive carbon has extended the range and output of the non-rotating carbon, reflector-type lamp used with copper-coated, non-rotating carbons. A new Suprex 7mm positive has made possible increases in efliciency and light output compared with Suprex 7mm carbons formerly used. New high-speed, reflector-type lamps employing rotating 9 and 10mm positive carbons have been l'narketed and are finding wide usage.

New Powerful Carbons

In addition to these combinations already in commercial usage, National

*T/Ju mill/r original/y zip/Imr'm/ in MM [altrrm/Imm/ 1))II/l'lill)lllll (Hill [A Ir/Hm/n/ I'Jw'r by .v/wrml pinyin/nu a] (by rdllm'.

FIGURE 1 shows maximum screen lumens at are currents tor various lamp carbon combinations.

1954-55 THEATRE CATALOG

By F. P. HOLLOWAY, R. M. BUSHONG and W. W. LOZIER

National Carbon Company A Division 0] Union Carbide and Carbon Corp.

Carbon Co. has developed several new carbons specifically to meet the demands of the new projection systems. These include the new Hitex 9 and 10mm carbons for rotating-type reflector lamps; and the new Ultrex* 10, 11, and 13.6mm carbons which are most effective when used with adequate water cooling in rotating-redector as well as condenser-type lamps. While these new carbons have not been placed on the





ROTATING. CONDENSER LAMPS -- market as yet, they will be available whenever suitable lamps are announced.

Figure 1 shows maximum screen lumens at different arc currents for various lamp and carbon combinations with not film, shutter or filters. Values of screen lumens obtained with the lamps and optical systems adjusted to produce 80 per cent side-to-center distribution ratio are not shown, but they generally fall 10 to 25 per cent below the maximum values. Figure 1 shows that .the rotating-type rehector and condenser lamps are capable of projecting more than 20,000 lumens with standard carbons, and more than 30,000 lumens with suitable experimental carbons.





I I 13.6 mm. "ULTREX"



CARBON

13.6mm.





"HITEX" SUPER CARBON

--ROTAIING, REFLECTOR LAMPS















J "ULTREX" CARBOI:

"HlTEX" CARBONS

. "ULTREX" CARBON



h











STANDARD CARBONS

-- - - EXPERIMENTAL CARBONS









THOUSANDS OF SCREEN lUMENS -- NO FILM, SHUTTER OR FILTERS

l L

llmm. til. CARBON #lOmm. H.l. CARBON











mm. "SUPREX" CARBON





i T



"SUPREX" CARBON

NON-ROTATING, REFLECYOR LAMPS





0 40 an 120 150



M 240 280 320 350 ARC CURRENT - .AMPERES
1954-55 Theatre Catalog, 12th Edition, Page 289