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RADIO BROADCAST ADVERTISER
291
Dealers Note
This is the most efficient, lowest priced, fastest moving source of B-power on the market. Our Detroit dealer sells two to three dozen a day. Write for dealer proposition before someone else gets it.
Why Buy "B" Batteries?
Music as smooth and clear as though it comes on "greased wires" — freedom from the annoyance of weak signals due to run down cells, and the continual fuss of recharging or replacing them — these are some of the advantages of using the Rhamstine* "B" RECTIFIER for the source of B-power.
Plugs into electric light circuit of 110 volts AC 60 cycles. Perfect control of detector voltage varying from 0 to 50; amplifier voltage 0 to 110. Operates efficiently on any tube set. Has no hum, no distortion, no acid, and cannot burn out tubes. Operating cost y3 cent per hour.
Five Day Trial
Use the Rhamstine* "B" RECTIFIER On your own set "under your local conditions for five days. See what volume you get on local stations — what silky smooth reception on DX — then, if you are not more than satisfied — if it does not do more than claimed for it — return it and Rhamstine* will refund your money. Mail the coupon to-day.
J. TWOS. RHAMSTINE*
506 E. Woodbridge St. Detroit, Mich.
Mail this f J thomas rhamstine (6)
r / 506 E. Woodbridge St., Detroit, Mich.
LfOUpOTl / Send me your "B" RECTIFIER by express C.O.D. subject to S inspection, at $25. It is distinctly understood that if I am not ' entirely satisfied, I will return it within 5 days and receive a r refund of the full purchase price.
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/ /
y/ Address
WATCH!
for announcement in August Radio Broadcast E. SINGER CO.
40 Hudson St. New York City
There's $ to be Made
Engraving Radio Panels
EVERY radio amateur who builds his own set wants engraved on the panel his name, trademark, dial markings, etc. You can do it for him if you own a Rapid Engraving Machine and make several dollars an hour doing it, part or whole time. Free particulars. Be first to own one and coin money. Write to-day.
BRANCH TOOL COMPANY Dept. G Forestdale, R. I.
Makes Any Condenser a Vernier
TURN knob either way for coarse adjustment; turning opposite way gives a 10:1 ratio of knob to condenser shaft covering ten degrees on the dial. A smooth cam does it.
The Branston Cam-Vernier Dial improves the appearance of any set; insures extremely tine tuning and accurate logging of stations.
Put one on every condenser. ( V±" shaft.)
Only one knob. No gears. No pushing in or pulling out knob. Perfectly smooth action.
Dials 4", knob 2%». Polished Genuine Bakelite. Very little metal used — just pointer (visible) and small cam (hidden) ,
Price $1.75 each, at your dealer's.
If dealer cannot supply you, order direct from us.
CHAS. A. BRANSTON, Inc.
813 Main St. Buffalo, N. Y.
In Canada — Chas. A. Branston, Ltd., Toronto, Ont.
Tested and approved by Radio Broadcast -j^T