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April 1951
WELLS COATES: PLANNING THE TELEKINEMA
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reinforced concrete wal 2^ ins. air space.
5. 1 in. rockwool blanket adjacent to external face of concrete wall.
6. Main wall: solid 10 ins. reinforced concrete.
7. 2 ins. rockwool on inner face of the concrete.
8. 4 ins. airspace.
9. Insulated brackets supporting expanded metal inner acoustic wall of solid plaster, or of perforated fibrous plaster, as required for internal acoustic correction.
Thus the wall insulation is composed of a series of membranes, the outer one being in the form of a " quilt ' ' which vibrates on its own externally, together with a solid mass of
ing, as will be seen from the illustration, is a development in mathematical terms of the regulated proportions of the external elevation.
The screen chamber component, constructed of double membrane dovetail sheet steel units, is rendered externally with cement and sand, the inter-space filled with dry sand, and the inner membrane sprayed with gunned asbestos to form a sound absorbing internal face around the loud speakers and ventilating ducts.
The access block flank wall facing the bridge is of solid r.c. 9 ins, thick. Externally
Fig. 7. The position of the Cintel apparatus when in use.
concrete insulated both sides with rockwool, plus the internal skin as described. The sequence of layers from inside to outside is hard, air, soft, hard, soft, air, hard, soft, hard. These are calculated to break down and absorb both high and low frequencies to the desired reduction of from 85 to 30 phon. Special arrangements are made for external doors ; these are of Holoplast plastic double skin slabs, filled with sand, and with an internal air space. The edges and trims are faced with perforated Holoplast filled with glass silk. The doors for the balcony exits weigh 500 lbs. per leaf.
The pattern of studs externally is revealed as an architectural feature, and their plac
there is an airspace, and a final layer of 3 ins. slabs of Gypklith rendered externally for final painting. Other walls of this component are similarly treated.
Special Equipment
We may now pass to a description, in general terms, of the special equipment in the Telekinema (see Fig. 3).
The Cintel projector1 moves out of its " kennel " into the central projection position, at approximately zero angle of throw relative to the screen, giving a 16 ft. x 12 ft. picture.
Opposite the television projector "kennel" is the E.H.T. room, and here Cinema-Tele