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1945 Theatre Catalog, 4th Edition, Page 583 (555)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 583
Page 583

1945 Theatre Catalog, 4th Edition, Page 583

the larger London theatres. By September, 1939, the following theatres had been equipped with these standard projectors:

Marble Arch Pavilion ........ ..1,290 seats New Victoria Cinema 2,564 seats Tivoli 2,043 seats Gaumont, Haymarket ..1,328 seats Gaumont, Lewisham 3,047 seats Tatler Theatre......,,...........,........ 683 seats

The incidence of war prevented the equipping 0f other theatres, and thus the plan to have selected television programs presented at twelve London theatres, to a total audience of approximately 22,000, was never realized. At the same period, Scophony, Ltd., with its system, equipped the Odeon Theatre, Leicester Square, and certain news theatres, and were attracting full audiences for Special programs (Figures 7 and 8). The postscript to this particular program of development was seen in the transference of some of this projection equipment to America, Where demonstrations were given in theatres in New York parallel with the RCA theatre demonstrations at the New Yorker Theatre. Some of the original Baird equipment manufactured in England and redesigned in America is still operating for private demonstration purposes in Chicago on the commercial television programs radiated in that city.

Light Valve Systems-Various theo. retical proposals have been made to secure projection with almost unlimited brilliancy by devising a television projector consisting of a cathode-ray-controlled image of varying density (for each element of the image), which, operating as a continuously variable lantern slide, can be projected by an external light source and lens on to the theatre screen (Figure 10). Reference is made later to seme 0f the methods that have been suggested, but the only practical result which has been achieved up to date is the AFIF projector developed

FIGURE 5.-Here is the front View of the Baird large-screen, double-headed projection television unit as installed in January, 1939. While a bit older than that shown in Figure 3, the equipment is of the same general type. A barrier fence, as high as the backs of the opera chairs, is generally erected to keep interested patrons away from the apparatus and to eliminate the danger of accidental damage to the equipment by curious patrons.

be of interest. The system and the equipment utilized therein can conveniently be divided up as follows:

(a) Pick-up equipment, consisting of cameras and associated equipment for synchronizing control for interior (such as studios and inside events) and for exterior (out-of-door) scenes together with the necessary sound pick-up, lighting, and power supply.

(b) Film scanning equipment.

(0) Control-room equipment, for the purpose of selection and routing of programs.

(d) Distribution network utilizing V

special cables or. high-frequency 'radio relay channels.

(e) Theatre television projectors and loud speakers. ,

Figure 11 indicates a possible system of pick-up, control, distributionyand thea'tre reproduction which is capable of dealing with events taking place mainly in the London area and distributed not only to theatres in London, but theatres in the provinces also. .

With the termination of the war, progress under all the above headings will recommence until eventually there is

evolved a satisfactory system which ex and built by Professor Fischer of the Swiss Federal Institute of Technology in Zurich. In this equipment a thin film of liquid is subject to the action of a cathode-ray beam, which deforms its surface in such a manner that the pointby-point density is changed in accordance with the picture pattern scanned on its surface. An exterior arc lamp projects through this film and a lens on to the theatre screen. So far the detail obtained has been of the value of ,a good 250-1ine picture. The work on this equipment has been going ahead rapidly during the war, and it is anticipated that a picture with higher detail will soon be available with ample brightneSs. The projector which is shown in Figure 9 appears at the moment to be rather expensive to manufacture.

FIGURE .6.-To supply the high-tension voltage to the equipment shown in Figure 3, a dual installation is made. Here are seen the high-tension units in duplicate that arevused to supply high-tension voltage to the Baird large-screen praiector installed in the Marble Arch Pavilion. in London, in January, 1939. Note, from the shadows, that the equipment is housed in airy but strongly screened-in locations. Note, too, size of the conductors!


The Complete Theatre System

It is the ultimate aim of the television engineer to provide the entertainment industry with a complete television system which can handle and distribute all types of program material which will

l945-YNEAIRE CAIALoo 555
1945 Theatre Catalog, 4th Edition, Page 583