The radio dealer (Apr-Sept 1922)

58 THE RADIO DEALER July, 1922 SCREW MACHINES IDLE Battery of Seven Automatic Screw Machines for Making Parts for Radio Equipment. SEND BLUE PRINTS AND SPECIFY QUANTITY The Carlyle Johnson Machine Co. MANCHESTER, CONN. DEALERS! We manufacture Vario-condensors and Plates 10,000 in stock. Vario-couplers and condensors Sliders Detectors IMMEDIATE DELIVERIES Wireless Service D. S. ROSEN 147 Fourth Avenue Comer 16th Street New York City Stuyvesant 6582 Immediate Shipment on IRVINGTON Flexible Varnished Tubing " Spaghetti " 5000 Volts — Puncture Test also on AERWIN PRODUCTS A'ariocouplers Variometers Special Detector Crystal Model A Receiving Unit Collapsible X-oop Antenna " Kentone " Radio Amplifying Horn WRITE The Mills Radio & Electric Co. Incorporated 1010 Springfield Avenue Irvington, N. J. FRANKLIN VARIOMETER Made of selected hardwood. Permanent contacts assure smoothness of operation, unsurpassed by any other make. Price $4.50 Sample sent prepaid §3.50 Dealers Write for Discounts FRANKLIN RADIO MFG. CO. 711 Penn Ave. Wllkinsburg, Pa. TO INTEREST AMATEUR What should be a strong pull for the radio enthusiast trade is manufactured by the Magnus Electric Company, Inc., of New York, in the shape of a code practicer and tester. This is a new device made with a high frequency buzzer, complete with standard battery, enclosed in a box beneath a panel so that no other connections are needed. One feature of the tester is that it is of the size of the ordinary safety razor box, and may be conveniently carried in the pocket. All metal parts are nickel plated. The binding post is provided to test sensitivity of crystals. The international code with directions is placed on the inside cover of the box of the outfit, which is of neat leather-covered material. The list price is $3.50. Another item in the Magnus Electric Company's catalogue is the Magnus Loud Speaker. The horn of this is bell-shaped, designed to give the maximum of acoustic expansion, and the entire speaker is mounted on a solid slate base to exclude all external vibrations. The base also, makes the loud speaker stable, so that no clamps or screws are needed. The outfit is heavily nickeled. Other radio parts manufactured by the company are grid condensers, variometers and variocouplers, crystal detectors, free and enclosed, tuning coils, sliders, dials, knobs and binding posts. FINE TUNING CONDENSER With the view to giving the heart of the radio set, the condenser, wider range, greater selectivity and permanent adjustment, the Radio Shop, of Detroit, Mich., has designed a new Vernier type, which is called the Microdenser. The manufacturer claims for this instrument a peculiar adaptability for the experimenter, because of its original shape. The accuracy, it is said, with which the microdenser can be adjusted enables the operator to tune out undesirable noises and signals heretofore impossible to eliminate. Due to a great range and fine adjustment, the maker says that it is possible to use this instrument for various circuits and purposes. The rated capacity of the microdenser is .001 mfd. When used in a vertical position the base may be filled with oil, thus increasing its capacity several times. The microdenser is suitable for either table or panel mounting. Its convenient size, only two and one-half inches in diameter, lends itself to either mounting. The list price is $7.50. IMMEDIATE DELIVERY DIALS NEW YORK RADIO DIAL CO. 80 Beaver St. New York City Dealers Attention We are distributors for Grebe, Murdock, Federal, Fada and others. We have a large stock of the above jobbers' products for immediate delivery. Send for proposition and discount sheet No. D. THE RADIO SHOP OF NEWARK 41 S. Orange Avenue NEWARK, N. J. Jobbers and Dealers ATTENTION ALL HARD RUBBER VARIOMETERS and VARIOCOUPLERS WILL NOT SHRINK List $7.00 Best Crystal Set on Market List $8.00 WRITE FOR DISCOUNT SHEET PILOT RADIO MFG. CO. 63 RICHMOND ST. NEWARK, N. J.