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RADIO BROADCAST ADVERTISER
Having a Little Trouble Tuning in the New Wave Lengths?
It's Your Condensers!
THEY were made when there was a wide difference between stations. Now, you need more than a condenser — you need a Separater to successfully cut out the overlap of two stations sending on wave-lengths only a fraction of a meter apart.
The Continental Separater is all that its name implies — a rigidly built low loss condenser, designed to make your set receptive over the full range of broadcast wave lengths from 0 to 1500 meters.
Sold with the new Continental Junior (the perfect vernier) at the price of any high grade condenser.
List Prices
Plate
Capacity
Price
13
.00025
$4.50
18
.00035
4.75
25
.0005
5.00
45
.001
6.00
If your dealer can't supply you, write Condenser Headquarters
GARDINER & HEPBURN, Inc. 611 Widener Bldg. Philadelphia, Pa.
Storage'B'Battery
Positively given free with each purchase of a WORLD "A" Storage Battery. You must send this ad with your order. WORLD Batteries are famous for their guaranteed quality and service. Backed by years of successful manufacture and thousands of satisfied users. Equipped with Solid Rubber Case, an insurance against acid and leakage. You save 50 per cent and geta
2-Year Guarantee Bond in Writing Approved
"tell their friends," That'Tour lest p?oof *
of performance. Send your order in today. Solid Rubber Case Radio Batteries
6-Volt, 100-Amperes $11.25
6Volt. 120-Amperes 13 25
6Volt, 140-Amperea 14.00
f R,uSber Case Auto Batteries
6-Volt, 11-Plate £11.25
6-Volt. 13-Plate ....... 25
12-Volt. 7-Plato lIlOQ
Send No Monev *ust sta*° bat
7,i ■ . , " tery wanted and
we will shiD day order is received, by Express C. O. D., subject to your examination on arrival. FREE "B" Battery included. Exlr?, °!f|sr: p per cent discount for cash in full with order. Buy now and get a guar anteed battery at 60 per cent saving to you , e WORLD BATTERY COMPANY 1219 So. Wabash Ave., Dept. 24 CHICAGO. ILL.
and Listed as Standard by Leading Authorties
including Radio News Laboratories, Popular Science Institute of Standards, Popular Radio Laboratories, Radio Broadcast LaboratorieSjRadlo _.,„_ <^In the Home, ^.--YandLefax.Inc.
[World
STORAGE BATTERIES
For AUTO
and RADIO
Harkness Scores Another Knock-Out
Kenneth Harkness, originator of the famous "Knock-Out" Harkness Reflex, has developed a new and better circuit — a 3-tube Counterflex. By a new method of varying neutralization for different frequencies, Mr. Harkness has obtained greater amplification per stage with this circuit than was hitherto thought possible.
Write to-day for 16-page illustrated booklet "How to build the Harkness Counterflex'' with complete building instructions and step by step wiring diagrams. Also ask for full details on our complete Counterflex kit containing all parts to build this remarkable receiver. Enclose 25c to cover cost of handling and mailing. Write now!
KENNETH HARKNESS RADIO CORP.
★ 727-739 Frelinghuysen Ave. Newark. N. J.
it Tested and approved by Radio Broadcast ^