Richardson's handbook of projection (1930)

Record Details:

Title:
Richardson's handbook of projection
Date:
1930
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000286
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
March 28, 2024
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1210 HANDBOOK OF PROJECTION FOR namic cone loud speakers. No batteries are used in connection with this equipment. In speaking of watts output, it is always spoken of as the maximum undistorted output. An amplifier with an undistorted output of 20 watts has the ability, provided acoustic conditions are reasonably good, to fill easily a 3,000 seat theatre with undistorted service. An amplifier operating with the volume control half off would be, practically speaking, operating at 10 watts output, hence would not be taxed to its limit. The same would be true of a 100-watt light bulb of the 110-volt type if 55 volts were put into it. It would be operating at 50 watts, or half capacity. REPRODUCING UNIT.— The reproducing unit, or rather the sound projection unit, is of the dynamic cone variety, using an eleven (11) inch cone. The field is excited by a one hundred (100) volt D. C. source supplied by a UX-280 tube working as a rectifier. This tube is mounted in the unit. The unit will respond to or from frequencies below audibility to those above audibility with equal uniformity. The reproducing unit is characterized by the elimination of false harmonic reproduction. NOTE. — The claims made in this description are manufacturer's claims. I have no reason to doubt their correctness, but of course cannot stand sponsor for them. — The Author. The unit is mounted on an easel which stands five (5) feet high and is twenty-six (26) inches wide. It is shown in figure. The easel acts as a baffle to the cone, which is rigidly attached to a support at the rear to the easel, but not to the baffle itself. If two cone