The radio dealer (Apr-Sept 1922)

September, 1922 THE RADIO DEALER 99 Lattice Variometer Estru Product Steps from Beaten Path in Form of Construction The majority of variometers to date have been of the single layer framework type. A deviation from this method is the variometer manufactured by the Dalton, Whittier, True Company of Chicago, 111. Manufactured under the trade name of Estru the variometer is lattice wound and occupies but 14 cubic inches of space back of the panel as compared with about 95 cubic inches occupied by the average variometer. It is about oneeighth the weight of the average variometer and has no framework of wood or other moulded material. This particular design of variometer, the company claims, produces as nearly as possible an ideal variable inductance, the measure of quality being represented by distributed capacity and low highfrequency resistance due to the method of winding. This assertion is based on the statement that an Estru grid variometer, at maximum inductance setting is only 30 micro-farads as compared with 180 micro-farads for a common wood block type. The Estru variocoupler is designed and constructed along similar lines to the variometer and matches it as to general size and appearance. The rotor is of the lattice wound type. The variocoupler is designed to operate with the lattice type variometer. NON-FATIGUE HEAD SET Those who have sat before a receiving set for an hour or more at a time will appreciate the light weight of the new Turney Heat Set manufactured by the Eugene T. Turney Laboratories, Inc., of Newark, N. J. Fatigue is claimed to be a negative quantity with this 3,000 ohm, eightounce head set. The material used is of the highest quality obtainable, which makes for a sensitive instrument, having a low distortion constant. The Turney Laboratories have produced this head set as a result of years of constant intercourse with telephone receivers, and in placing it in the market they claim it to be of the best. WANT CATALOGS? Retailers and jobbers who desire Radio catalogs are advised to send their name and address to the Service Bureau, Radio Dealer.* The One Outstanding Detector GREWOL Nationally Advertised A well-established product. Proven out in practical use under all conditions by amateurs everywhere. One fan recommends it to another. It pays to sell so popular an article. A Good Proposition For Every Radio Dealer Permanent Adjustment Always Set and Ready Class Enclosed $2 RANDEL WIRELESS CO. (Actual Size) Sole United States Distributors 9 CENTRAL AVE. NEWARK, N. J. !!!THE PREMIER RADIOVOICE ! ! ! Is the first practical and commercial accomplish m e n t of meeting the p u b 1 i c's requirements and demand for a Complete, Simple, Compact, Attractive and Efficient Loud Talking-Detector and 2-Stage Radio Receiver at a Popular Price, Simple in Control — 'Wide in Range. Mounted 011 a B a k e 1 i t e Panel are Premier Built and Tested Radio Condensers, Rheostats, V. T. Sockets, Transformers, Tuning Coils, Jacks, etc. ; the panel being hinged within the beautiful 5 ply Mahogany Veneer Loud Talker Cabinet, measuring 21" in height by 12" in width, weighing, completely equipped with "B" Batteries and Loud Talking Phone as shown, only 17 lbs. Can be set in a corner of the living room, on library or end table, or on a piano, blending into the richest of furnishings with equal attractiveness. Price complete, excluding only bulbs and "A" battery — $95.00. Where an even lower priced equipment is desired, eliminating the phone and loud talker cabinet, our Type P equipment, including " B " batteries, mounted in cabinet as shown, parts, hookup and panel being identical to that used in the Premier Radiovoice, is priced at $55.00. The Premier Radio Corporation is an old electrical manufacturing concern, which has turned its entire resources and equipment to production of high class radio parts and receiving sets. The Premier line is handled and is available to only the highest class of dealer, jobber or distributor, and to such is offered discounts to permit profitable merchandising. Descriptive bulletins sent on request. Premier Radio Corporation 6800 Bostwick AveDetroit, Mich.