Radio Digest (July 1924-Apr 1925)

August 16, 1924 RADIO DIGES T— Illustrated Convenient Table, Chair and Tool Box Tool Chest in a Chair and a Table or Bench A Radio work table that may be turned into a chair and at the same time be a tool box will add considerably to the WORKSHOP KINKS EARN A DOLLAR— J THERE are many little kinks worked out at home that would aid your fellow Radio worker if only he knew about them. There are new hook-ups, new ways of making parts and various unique ways of operating sets that are discovered every day. Radio Digest is very much interested in obtaining such material. Send them in with full details, including stamped envelope, so rejected copy may be returned. The work must be entirely original, not copied. RADIO KINKS DEPARTMENT, Radio Digest, 510 North Dearborn St., Chicago home constructor's comfort and convenience. To be satisfactory the work table must be strongly and firmly built. Hard wood is difficult to handle but undoubtedly the Material List 2 sides 28 inches long, 18 inches wide and 2 inches thick. 2 top supports 20 inches long, 4 inches wide and 2 inches thick. 4 pins to fit holes used. 1 top 36 inches long, 24 inches wide and 2 inches thick. 1 box top and bottom each 20 inches long, 18 inches wide and 1 inch thick. 2 box slides 20 inches long, 7 or 8 inches wide and 1 inch thick. 2 box ends 16 inches wide and 5 or 6 inches deep. most satisfactory for stiff construction. To make the table steady and strong first assemble the parts forming the box. The Guaranteed Head -Sets RED-HEADS" are guaranteed radio phones. You run no risk when you buy them. Money back if, after 7 days' trial, you're not satisfied that they're the hest receivers on the market at the price. Why not act right now and get a pair ? It'll mean getting the maximum from broadcasting from the day you put them into use. NOW READY The new 1924 Model F I The new "Red-Head" Jj. $6.50 r $5.00 p< Complete yw.vv Complete "Red-Heads" sent prepaid on receipt of price if you are unable to get them at your dealers. THE NEWMAN-STERN COMPANY DEFT. R. 0., NEWMAN-STERN BUILDING, CLEVELAND, OHIO VARIOMETER and VARIOCOUPLER Pat. Pending A compact No-Loss inductance for that summer portable Pfanstiehl Variometer, F-301 $4.75 Pfanstlehl Variocoupler, P-300 5.00 Stagger-wound coils for every circuit PFANSTIEHL RADIO COMPANY Highland Park, 111. Chicago: 1001 W. Washington St. Haymarket 8010 THREE IN ONE UTILITY PIECE 36^ 24" 1 V_4 PINS NEEDED * FRONT VIEW W Y »Vt c FRONT VIEW SHOW WO TOP TURNED BACK MAKING TH6r» ■X CHAISE £ :: ) u fl tii -.» END VIEW ■16" -2.0 3 TOP SUPPORT end pieces are fastened to the box 'with glue and screws. The top is laid in place and marked so that the position for the table supports may be accurate. For a work table it is best to use pins as shown One set to swing the top on and the other to hold the top firmly in place when the piece of furniture is being used as a table. If the table is to be used as a companion piece to the cabinet described in the Radio Digest for June 21, 1924, it should be finished to match the cabinet. A sturdy cushion will add to the comfort of the seat and a table cover to match will cover the mars to the top that will doubtless appear. Canvas pockets placed inside of the box cover will be convenient for small tools. The box may be made still more convenient by building trays to fit within it. The trays make the tools easily found and quickly replaced when work is finished for the time. Two stencils suitable for the cushion imiimimillllllllllliilliiiiiiuiilliiliiiiniiiiiiiniiitiiiiiiiniiitiiilliiiiiililliiiiiiiuiiiiiii The Dubilier Duratran The radio-frequency transformer that amplifies uniformly over all broadcasting wave lengths. Made to satisfy the man who knows radio. DUBILIER CONDENSER AND RADIO CORP. 43 West Fourth Street, New York >ii Mini! 1 1 imm i tin i Mill 1 1 mil u him inn i liin Ll mil i urn [ l nil ! mi 1 1 : nil n iti! 1 1 inn mi in n it: KEYSTONE RADIO LIGHTNING ARRESTERS $1.50 At AD Dealers Buy your Keystone Arrester today — install it according to instructions supplied, and forget about lightning. Made of Bakelite — weather-proof. No vacuum to lose. Approved by Underwriters. At all Dealers, $1.50. Manufacturers of over a million Lightning Arresters ELECTRIC SERVICE SUPPLIES CO. 17th and Cambria Streets, Philadelphia 53 W. Jackson Blvd., Chicago 50 Church St., New York and table cover. One symbolic of Radio and the other a conventionalized basket design. To stencil use oil paint as it comes from the tube. Use a short thick brush using a tapping motion. Do not use a brush stroke as the paint will pass under the edge of the stencil and make poor edges on the design. Very coarse material such as monks cloth, hand woven linen or crash will make the most serviceable cushion top and table cover. — Bertha Morey, Ottumwa, Iowa. Lead-in Logic The lead-in is an important item for perfect reception. It should be well insulated and kept distant from the sides of the houses along which it is brought down to the receiver. Also it should not run adjacent or parallel to other currentcarrying conductors of any kind. At the point of entry into the house special precaution must be exercised. If the wire is bare, without any covering, it should be passed through a long porcelain tube or brought into the house through some other insulating medium. Under no condition should the bare wire touch any part of the building. After the wire has been brought into the room it should run to the aerial binding post on the receiver in the most direct path with the minimum amount of turns or twists. What About It? Isn't it about time to stop experimenting with multiple control circuits and build one that, combining ease of assembly and operation, loudness, clarity and selectivity of signals, as well as beautiful appearance, is excelled by none? THE ELGIN SUPER-REINARTZ RADIO RECEIVING SETS Embodies all the advantages of the well known Elgin Reinartz (the set which was largely responsible for the popularity of this wonderful circuit) and many others. It is much louder, more selective, requires no storage battery, and can be used with excellent results on a short or loop aerial. It has brought in 2LO England, and California stations two thousand miles from Elgin, clearly and without interference on a loud speaker with only one tube, and that while our powerful local station was broadcasting three miles away. Could you ask for more. Send 2-cent stamp for circular giving one, two and three bulb hookups of this remarkable circuit. ELGIN RADIO SUPPLY CO. 207 East Chicago Street ELGIN, ILLINOIS C0NN£U/£Y ELECTRIC (.ABORATORfES 3Q9 Fifth Avenue new YORK CITY Bearing Clamp Ends Condenser Shaft Wear Having a 43-plate condenser that the shaft friction adjustment would no longer permit easy tuning, I tried the following scheme with very satisfactory results: A piece of ^4-inch bakelite was cut %-inch wide and 1%-inch long and drilled and tapped as shown in the illustration. This piece was split with a hack saw after the 14-inch shaft hole was drilled, to make a friction clamp for the shaft. The 6-32 DRILL »29 OR 9/64-" HOLE IN0NE ARM TO PERMIT S-32 SCREW TO PASS THROU&H FREELY. SPLIT PIECE SERVES AS A CLAMP. DRILL *350ri7/64'H0Le I e-32 I1ACHINE SCREW ANDTAPWITH6-3e USED TO MAKE MACHINE TAP, THEN 4 FRICTION AS DESIRED ON CONDENSER SHAFT SPLIT PIECE 1£'AFTEI ^.HOLE HAS BEEN PRILLED FOR SHAFT BAK.ELITE PIECE DRILL*35 0R7/64' HOLE IN CONDENSER, AND TAP WITH <S-3,S SO THAT BAKELITE PVEXE. CAN TBE FASTENED TO CONDENSER. screw passes freely through one of the arms and screws into the remaining arm, thus providing an easily accessible adjustment whereby the dial can be made to turn according to individual taste. This stunt made a better than new condenser out of the original. This friction may be attached to the panel, just back of the dial if desired. — H. E. Jameson, Milwaukee, Wis. Radio Dealers HERDQURRTERS [eight big warehouses TO SERVE YOU big: ' , CATALOG FOR ■■;.;.; DEALERS DEALERS Write on your letterhead for this big catalog. Ask for A1002 The New STAR Type E. Detector For Crystal or Reflex Sets Price 00 1 Star Type E Detector We offer the STAK TYPE E Detector which is covered by our guarantee of complete satisfaction and is sold at the LOWEST PRICE of any RELIABLE DEThis detector is well TECTOR on the market, made and is set with one of our very best rectifying materials. It is made so that in case of necessity it may be adjusted and while it is not especially designed for reflex sets many excellent reports of performance on these sets have been received. THE TYPE E DETECTOR IS THE BEST BUY IN THE CRYSTAL, MARKET TODAY and will be sent subject to exchange for any other item we make. DEALERS send to-day for our FALL CA TALOGUE NOW READY, and gel alt set for the big season ahead.