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Page 58
Projection Engineering, September, 1929
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public adores!
'SYSTEMS
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ROLA loudspeakers, Ions noted for their quality, are now provided for every purpose demanding the utmost in fine sound reproduction.
These electro-dynamic loudspeakers operate at approximately twice the sensitivity of competing dynamics, yet without increase of field energizing power.
Kola reproducers have proven rugged and dependable under the most exacting conditions. The Kola exclusive welded-to-housing construction, adjustable center pole tip, ventilated field windings, and moisture-proof materials insure reproduction of unusual reliability.
The highly desirable compactness and simplicity of the Kola loudspeakers is apparent at a glance. A side-by-side comparison will quickly demonstrate their superior reproduction qualities, Kola provides the consistently brilliant and reliable performance required today by your users.
The Rola model illustrated above Is C-90: an electro-dynamic unit with 9-inch diaphragm, field coil wound to 2500 ohms. 75 to 150 volts D.C. It is especially well adapted to amplifiers using 245 tubes in push-pull combination — for radio receiving sets, electric phonographs, and auditorium Installations.
Inquiries for details, blueprints and prices from responsible manufacturers are solicited.
The ROLA COMPANY
CLEVELAND, OHIO
OAKLAND, CALIF.
2570 E. Superior Ave. 45th & Hollis Sts.
ROLA
Jenkins 8C Adair Condenser Transmitter
TYPE C
The type C condenser transmitter is the result of two years actual experience, during which these instruments have been used under all conceivable conditions, and in practically every part of the world wherebroadcasting or electrical recording is carried on. In addition to their excellence as pickup devices, they have proven to be extremely durable and rugged, and have shown a minimum upkeep cost.
The type C transmitter is built for 6 or 12 v. A battery, and 180 v. B battery. The filament draws % amp., and the plate, 3 to G M. A. The amplifier has a single stage and uses a standard tube. The transmitter unit is heavily gold plated, and the case is finished in dark brown enamel. 20 ft. of special double shielded cable with plug and socket are supplied. Our bulletin No. 6 describes this instrument in detail.
JENKINS & ADAIR, INC. 1500 North Dearborn Parkway, Chicago, U. S. A.
Cable Address : Jenkadair
Telephones : Superior 0 3 7 2
w
E offer to manufacturers interested, in.
EXPORT
tne services of a dependable organization, well established in tbe entire foreign field
AD. AUMEMA, Inc.
Manufacturers' Export Managers
116 Broad Street, New York, N. Y.
Microphones
2-Button Type
For Public Address, etc., list. . .$25 Standard Broadcast Model, list . . $75
Condenser Models for Film and Record Work,
list $250.00, $300.00
Also Desk and Floor Stands, Covers, Cords, etc. Miniature
Microphone, Paper Weight, Radiator Ornament. Die Cast,
Bronze finish; prepaid on receipt of $1.00.
EXPERT MICROPHONE REPAIRS Dealers everywhere
UNIVERSAL MICROPHONE CO., Inglewood, Calif.
CHICAGO: NEW YORK: SAN FRANCISCO:
Fred Garner Co., Gotham Eng. & Sales Co., C. C. Langevin Co., 9 S. Clinton St. 50 Church St. 274 Brannon St.