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RADIO BROADCAST ADVERTISER
thousands of users of De Forest Audions is what you naturally expect from this product. Remember that De Forest invented the three-electrode vacuum tube which makes all present-day radio possible, a
DEFOREST RADIO TEL. & TEL. CO.
Dept. R.B. 7 Jersey City, N. J.
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A f fj> / ^BATTERIES ' ^^U^
V CHARGES ' _i AUTO
~k BATTERIES .
RADIO B
, BATTERIES
Triple Duty
The type A-B. F-F Battery Charger charges up to 120 volts on "B" battery as well as 2, 4 or 6 volt "A" or auto battery.
No fuss or trouble — anyone can operate successfully. Simple and Fool proof. The pioneer battery charger — a success for over ten years. Type A-B, price $20, West of Rockies $22; Type 6 for "A" battery or auto battery charging $15, West of Rockies $16; B battery charging attachment $2.50 extra.
Write for literature with data on battery maintenance, station calls and wiring diagrams of basement installation of batteries. Send name of nearest dealer.
THE
FRANCE MFG. CO.
10441 Berea Road CLEVELAND, OHIO
A Pleasant Surprise Awaits the User of the A. C. H. Sharp Tuner Dials
Why the A.CH. is different,
3 in. DIAL » ACJI. > (l56-tO-l )~
4 in, DIAL »ACJL > (215-tO-l )
Will improve any receiving set, making difficult tuning easy Money Back Guarantee
Price 3-inch size $3.50 Price 4-inch size $5.00
Regular fitting 5/16 shaft. 1/4 and 3/16 5c each extra
Extra Advantage of the A C H
Can be attached or removed from any instrument. Rough tuning same as any dial.
Movement so fine that the eye cannot detect but the ear can. Automatically locks instrument so no jar can disturb it. Dial grounded reducing the body capacity to a minimum. Special dial 2 graduations where ordinarily one. MAIL ORDERS SENT PREPAID IN U. S. A.
C. HAYDEN RADIO & RESEARCH CO. BROCKTON, MASS., U. S. A.
if Tested and approved by Radio Broadcast ^