Close Up (Jul-Dec 1929)

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CLOSE UP actinic electric cell, and the photovoltic cell; are all docketed neatly. Elementary laws of acoustics are sketched in ; for example : one can learn, or remind oneself, that walls closer than 50 feet can give no echo, and that l = v/n. I admit that Mr. Cameron has the honour of being the first to explain television to me so that I could begin to cultivate a bored attitude of superiority towards it after reading his words once only. A lot of space is devoted to studio technique. At the Fox joint the inner walls are made of 4-inch solid gypsum blocks, 1 inch of hair felt, 3 inches of air space, and another layer of 4-inch gypsum blocks. The outer walls are made of brick and masonry and are about 24 inches in thickness. A double ceiling, concrete plaster separated by a 3 inch air space and 1 inch of hair felt, is supported from roof trusses. Floors are covered with soft carpets, inner walls are draped with Celotex, and heavy ^lonk Cloth is hung perpendicularly to the walls and ceiling so that it can be raised or low-ered to meet the degree of resonance required. The air is changed every 8 minutes. Boy, they don't do these little things by half measures, in other words they look after their barrels of tar and hope that the pounds but that sentence ought to have nothing to do with the rest of the article. The monitor is the important new technician in the sound studio. He looks down on the set, through three thicknesses of glass, and controls the sounds from a sw^itchboard ; he can tone down a violin and tone up a drummer w^hen both are playing in the same orchestra. 326