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Projection Engineering, September, 1929
Page 61
The Burt Reproducer for Talking Motion Pictures
Burt Reproducer on Powers Projector
Features
Synchronous Motor Drive (110 or 220 volts, 50 or 60 cycles). Prevents variation in speed from variation in line voltage, or projection load.
The Super Cells used require only two stages in head amplifier, hence less distortion.
Ease of Threading. When running disk or silent, the Sound-on-Film unit is not threaded. Soundon-Film threads as easily as through a Powers gate.
Turn Table Is Accessible, being up high at the side of the machine.
Easy to Install. Installation can be made by the ordinary operator, and wire man.
Projector Head is driven by its main drive gear and is not required to drive any part of the sound equipment.
Only Three Shafts: (1) Motor Drive Shaft, (2) Sound Film Shaft, (3) Disk Table Shaft.
Variable Si>eed can be used for making schedule by driving the head off the Powers Motor, when running silent. Change from synchronous drive to variable speed drive requires about ten seconds.
No Universals — No flexible couplings, flexible shafts, or long unsupported shafts are used, as these produce tremolo.
Fire Hazard Is Decreased by use of this equipment. Failure of take-up does not cause film to pile up in light.
Write for Bulletin No. 291
Manufactured by
R. C. BURT
SCIENTIFIC LABORATORIES,
900-904 East California St.,
Pasadena, Calif.
For Amplifiers: — Poly met high-wattage resistors Poly met high-voltage filter condensers.
For Equalizer Networks: — Polymet small fixed condensers— Polymet resistors.
For Power Transformers, Audio Frequency Transformers, Impedance Adjusting Transformers, Loudspeaker Units: — Polymet Coils ("Polycoils")
Send for our catalogue giving complete specifications of Polymet Products. We will gladly supply samples and work with you to meet particular specifications.
Polymet Mfg. Corp.
839-A East 1 34th St. New York City
Polymet Products
Crowe
Nameplates
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and
Escutcheons
FOR YEARS the name of CROWE has been synonymous with fine escutcheons and name plates, and the demand for CROWE products in the radio, phonograph, and electrical fields attests to this fact.
WE ARE prepared to submit to manufacturers in the sound and light projection industry samples and estimates on name plates, segments, dials, scales, special embossings and escutcheons.
CROWE ENGINEERS will give careful personal attention to each manufacturer's problems, and invite consultation — with no obligation on your part.
"Travel by Ait
Use Ait Mail"
Crowe Name Plate 8 Manufacturing company 175 6 Grace St., Chicago, 111.