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1947-48 Theatre Catalog, 6th Edition, Page 282 (268)

1947-48 Theatre Catalog, 6th Edition
1947-48 Theatre Catalog
1947-48 Theatre Catalog, 6th Edition, Page 282
Page 282


1947-48 Theatre Catalog, 6th Edition, Page 282

Electronic Control for Stage Lighting

High-Current, Gas-Filled Thyratron Tubes

Used as Contactors and Dimmers in System

The electronic system for the control of stage lighting, as described in this article, is the result of a Lila-year development project, and was demonstrated for the first time at the University Theatre of Yale University, where it remains as a permanent installation. It represents the first full-scale attempt to control stage lighting by means which are entirely electronic.

THE ELECTRONIC SYSTEM The all-electronic system for the control of stage lighting is based on the use of the high-current, inert-gas-filled thyratron tube, used both as contactor and dimmer.

All functions of both switching and

FIGURE leThe console and pre-set panel. The console is a pre-wired steel desk, containing 44 individual control circuits, with all the necessary mastering, tading, and switching controls with their associated indicating devices. Attached to it by a swivel ioint is a pre-set panel containing 44

GEORGE C. IZENOUR

Designer and Engtluwr

dimming are accomplished in a single network which is remotely controlled and comprises two main elements: a console with attached pre-set panel, shown in Figures 1 and 2; and a tube bank, shown in Figures 3 and 4.

The console is a pre-wired steel desk, containing 44 individual control circuits, with all necessary mastering, fading, and switching controls with their associated indicating devices. Attached to it by a swivel joint is a pre-set panel containing 44 pre-set control units, each made up of ten pre-sets, thus making 440 presets in all.

pre-set control units,

The tube bank is a pie-fabricated steel rack-and-gutter arrangement, wherein are plugged 44 electronic switching and dimming units, 38 being of 1.5 kw. capacity and six of 6 kw., making a total control capacity of 93 kw.

The complete system is unitized and, as such, is demountable unit-by-unit and control-by-control, from master rack and console, respectively. By means of Figures l to 4 and the block diagram of Figure 5, the following outline explains the function of the separate elements of this system.

The Console Desk

The console desk measures 60 by 44 by 22 inches and the attached panel 50

each made up of ten pre-sets, thus making 440 prevsets in all. The all-electronic system for the control 01 stage lighting is based on the use of the high-current, inert-gas-iilled thyratron tube, employed in the role of contactor as well as in the part of the dimmer.



THEATRE CATALOG 1947-48
1947-48 Theatre Catalog, 6th Edition, Page 282