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RADIO BROADCAST ADVERTISER 219 QREATER ^DISTANCE FINER SELECTIVITY GREATER with SUPER-SENSITIVE INDUCTANCE UNITS Tuned Radio Frequency Kit #12.00 The Aero Coil Tuned Radio Frequency Kit illustrated above will positively improve the performance of any receiver. Patented Aero Coil construction eliminates radio frequency losses and brings tremendous improvement in volume, tone and selectivity. Kit consists of three matched units. The antenna coupler has variable primary. Uses .00035 condenser. 8 page color circuit, lay- out and instruction sheet for building the supersensitive 5 tube Aero-Dyne receiver packed FREE with each kit. Extra copies, 75c each. Low Wave Tuner Kit #12.50 Completely interchangeable. Adapted by experts and amateurs. Range 15 to 130 meters. Includes three coils and base mount- ing, covering U. S. bands, 20, 40 and 80 meters. You can increase the range of this short wave tuner by securing coils No. 4 and 5. Combined range of 15 to 550 meters. Both interchangeable coils fit same base supplied with short wave kit and use the same conden- sers. Coil No. 4, price $4.00; Coil No. 5 price $4.00. These Aero Coils are available at your dealers. Get yours today! AERO PRODUCTS, Inc. * Dept. 109 1772 Wilson Ave. Chicago, 111. PERFECT FILAMENT CONTROL Provides complete noiseless filament con- trol for all radio tubes without change of con- nections. Metal parts are nickel plated. One hole mounting. Self contained switch opens battery circuit when desired. Brach CONTROLIT A WORTH WHILE GIFT R\DIO devotees will be glad to get a Brack Con- trolit on Christmas morning. Controlit is new. It's novel. It's different. It is something that will add enormously to the enjoyment of radio. Adding a Controlit to any set eliminates ALL switches from "B" Battery Substitute and Trickle Charger and places complete automatic control of set and power supply in one switch — the SET SWITCH itself. It is the gift of gifts to owners of radio sets. It should go with every new set at Christmas time. Price $6 «in U.S. A. BRACK lightning Arrester No aerial should be without the protection to radio and home which a Brach Lightning Arrester affords. Good sense demands this protection. The authorities require it. Every Brach Arrester carries with it a $100 insurance guarantee. Prices as low as $1 The New Brach TOTEM-POLE ANTENNA Here is an aerial antenna that gives most complete reception and unusual clarity to radio. It is the size of a small flag pole, can be readily attached to roof or side or window ledge of house and does away with all unsightly makeshifts. Totem-Pole Antenna with 100 feet wound wire and fasteners, complete for Only $1O Drip-Proof HYDROMETER To the Hydrometer with the famous Chaslyn Balls is com* bined the Drip-proof feature which insures full protection against battery acid falling on and injuring parquet floors* rugs or clothing. After testing battery, the Hy- drometer can be washed with* out danger from dripping acid. Something nice to present to a radio fan or to buy for your own use. Price $1 •J Radio Products L. S. BRACH MFG. CO., Newark. N. J. L. S. BRACH OF CANADA, Ltd., Toronto, Can. *i( Examined and approved by RADIO BROADCAST if