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is the manner in which many critics have expressed themselves after enjoying a sound demonstration with GENERAL AMPLIFIERS and we believe this fittingly describes our devices.
You will undoubtedly have to supply much sound apparatus and if your first installation meets with complete satisfaction you are in line for some interesting business. The amplifier is the nucleus of all sound installations, so why not be safe with a GENERAL AMPLIFIER? We offer a laboratory-tested device and one guaranteed against defects in workmanship. All GENERAL AMPLIFIERS possess unusually flat frequency characteristics and provide for the full undistorted power output of the tubes employed.
We maintain a free engineering service and are desirous of co-operating at all times. Consult us freely and write for Bulletin PE-1 today.
Model GA-20 (Less Tubes) $225.00
GENERAL AMPLIFIER CO.
27 Commercial Ave. Cambridge, Mass.
565 Washington Blvd. Chicago, 111.
274 Brannan St. San Francisco, Cal.
Projection Engineering, September, 1929
twisted' Biting leetti °f Steel
TIGHTEN the nut against the SHAKEPROOF Washer and it's there to stay. Gripped by twisted steel teeth, around the whole circumference, it can't loosen — applied pressure with a wrench alone can break its hold. SHAKEPROOF Lock Washers were developed for one purpose — to lock nuts. That they do this superlatively well is indicated by their universal adoption in over a hundred and fifty different American industries. Today SHAKEPROOF is the standard lock washer. It should be on your product. Let us send you samples to prove to yourself the merits of SHAKEPROOF.,
Lock Washer Company
7* [ Division of Illinois Tool Works J ** **■
XS09 North Keelcr Avenue Chicago, Illinois
V. S. Patents 1,419,564; 1,604,122; 1,697,954.
Other Patents Pending. Foreign Patents.
FREE SHOP TEST SAMPLES
SHAKEPROOF LOCK WASHER CO.
2509 Nonh Keeler Ave., Chicago, 111.
Please send me samples of
□ Shakeproof Lock Washers to fit bolt size__
□ Shakeproof Locking Terminals, size
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Williams Press, Inc., new york — Albany