Indianapolis Times, Volume 36, Number 248, Indianapolis, Marion County, 26 February 1925 — Page 23

SERIES-PARALLEL SWITCH CONVENIENT FOR FANS

■ 9 *- W ser Rece/vci'S i , J ® —•* ' 7 70 ?{ ]l — a —■ - -=r* m .rff- • ■'

BIX OONNBCTIONS BT MEANS OF A SERIES-PARALLEL SWITCH

BY ISRAEL KLEIN NEA Service Radio Editor K experienced fans can’t do .J without a series parallel •witch. A series parallel switch is one that is so constructed as to permit the connection of either of two pieces of apparatus *o another, or the switching of positive and negative connections, between two electrical circuits. The simplest form of switching to which this is applied is shown in No. 1 of the accompanying ■ketch. The series parallel wwith, in this case, is connected so that either the headset or the loud speaker may be used with a receiving set. All it needs is twisting from one to another. The receiver has four contacts as shown, and there are two each to headset and loud speaker. The contacts are made as sketched. Saves Batteries Sketch No. 2 shows a useful and convenient arrangement whereby the battery current to the receiver from both A and B batter) *sj may be turned on or off. Tht> switch controls the current from both these bat tries and saves wasting of current when these are not in use. The connections and taps are made as shown, with the A battery along the line at the left of the two. If you happen to have two aerials, or an outside areial and a grounded loop, sketch No. 3 shows how to Join these to the set through a series-parallel switch. By this arrangement either ohe of the aerails may be chosen by the mere turning of the switch. A variation of this is shown by - sketch No. 4. Here there is one aerial and ground, but two receivers. Thus one or the other receiver may be switched to the aerial and ground. For Teeters Sketch No. 5 shows a convenient arrangement by which the polarity of the. A battery may be switched. Experimenters will find this one of the'most useful means or using either positive or negative voltage on the filaments, at will. The last sketch is useful to every fan. It shows how to arrange the switching points so that Comics by Radio Diddy won’t have to read the Sunday comics to the children any longer. AU he can do is tune in on WGN, Chicago, and hear the comic characters of a popular strip take the air and entertain the youngsters. B-Battery Eliminator Several types of B-battery eliminators are now on th emarket. They work from either alt arnating or direct current and a: variable for whatever amount of plate voltage is desired. radio, the naval communications service conducts other forms of communication, such as messages by sight and sound, by pigeons, by posts, and, of course, the mails. The Paulist Fathers are soon to establish a Roman Catholic broadcasting station in New York City.

the battery can be connected to the set or to a battery charger for recharging. After the set is used each night or every other night, the switch can be turned over to the charger side and the charger allowed to bring the battery up to normal value. 1 Keeping the "lavt-Loss” Coil Keep the "low loci” in low loee colls by making them self-support-ing. If four leads are taken from such a coil leave the ends of the windings long enough to solder to bus wire attached and perpendicular to the terminals of the lnstru ments the coil leads hook to. Making such a "cradle” eliminates sup ports "for coils that migbt cause losses. Popular Fan The work amateurs do in radio telegraph of commercial and other messages is shown by. the recor. just made by Ralph Barnett of S'.. Louis. He handled 335 private messages in December. Sets for Liners Radio receiving sets may he installed on all the United States liners for the entertainment of the pas sengers as the result of successful experiments made aboard the George Washington* during its last voyage. — r The new station is WMCA. owned and managed by the Hotel MeAlpin, at Broadway and Thirty-Fourth St Tt will operate on a wave length of 428.5 meters and will be on the air approximately fifty hours a week. Broadway’s Great White Way Is to have an official broadcasting station of its own, to provide a nightly rendezvous for celebrated stars of stage, screen and concert platform.

Homemakers

{£•: v |t ' . . _. _ ;. *,;

Station WLS at Chicago has a new director for its Homemakers’ Hour, in the person of Mrs. Grace Viall Gray, who is shown here. She talks to housewives every wee kday except Saturday, from 3:46 to 4:46 h. the afternoon. She is home economics chairman of the first district of the Illinois Federation Women’s Clubs and was once assistant professor in horns economics at lowa State CW’ege. w•' '' ' &TkSSw'l .v

THE INDIANAPOLIS TIMES

All Married Women entertainers of WSUI, the University of lowa’s station at lowa City, don’t know what to do with the large number of proposals they have been receiving from all sides of the country. It’s worse when the fact is known that each is already married. Test Strength A study is being made by Government scientists into the apparent drop of strength in the signals received at Washington from the Pacific coast and from Europe. The signals are reported weaker than were those of a year ago. Shield Dial Backs If body capacity is noted, shield the dial backs and ground this tinfoil shielding to the rotor of the condenser or the ground wire. New Station Nicaragua now has a powerful radio transmitting station which will be used mostly for comerci&l work. To stop rattling In your loud speaker unit drop a bit of shellac on the pin Joint In the middle of the diaphragm. A narrow disc of blot*lng paper placed inside the cap so that it laps over the edge of the diaphragm also will help. A layer or so of thread wound around the telephone cord where It is wearing out will stiffen it and keep the inside flexible conductor from breaking.

4th ANNUAL Radio Clearance Sale Everything in our Radio Dept.—Goes at a TREMENDOUS SACRIFICE—Sets and Accessories—Here is your opportunity to own a high-grade Radio Outfit—This sale will only last ONE WEEK—Come Early—While our stocks are complete. EVERYTHING FOR CASH ONLY

Special “Remler Kits” *76= The Greatest Radio Value Ever Offered—Our Regular $95.00 Kit

Two-Ton# Walnut Cabinets for Rentier Kits—*2P

This kit includes all Remler parts—Bakelite face and base panels—Drilled, tapped and engraved—Full size blue print and instructions. ONLY A FEW LEFT AT THIS PRICE—GET YOURS NOW

Miscellaneous Parts $9.69 Loops for Remler Kits $6.50 fl.oo 3-plate Condensers 30c $2 60 23-plate Condensers $1.50 |3.00 43-plate Condensers 75c 25c Soderall 19c * $3.25 Solder Irions ... $2.00 $1.50 Solder Irons 95 c Buss Wire, 2-ft. lengths, 2 for ......... 5c Spaghetti, 2-ft. lengths, 2 for 16c Spaghetti covered wire, per length 10c Variocouplers Amrad $2.00 * Atwr.ter Kent $2.00 Work Rite $2.49 Transformers $£.25 Star 3-1 $2.40 $2.76 Star 6-1 $2.83 $4.00 Thordarson 3-1.. .$3.00 s4.soThordarson 6-1... 13.38 $4.50 Kellogg $3.38 $7.00 Jefferson $4.90 $7.00 Karas Transformer $5.00 $13.00 Thordarson, push and poll $9.10

HATFIELD ELECTRIC CO. Meridian at Maryland—MAin 0123

S&&SMI mmgm, littg ISSflalMiBI I’ * wife’ll \\ 11 mmr v\\ ; \ mUK |1 1 8 fIPU < \ 31 i AJm ffirVfr • t V * \ . hu&HSREB mM -IiIBKLV a ■ l^i |Bi ~ >■-■ i]l mk BTirfai BCI A) ip - ■" ■ ' ———•

WE LL HAVE CLEARER AND BETTER LOUD SPEAKERS ON OUR RADIO SETS SOON IF THE DEVICE INVENTED BY DR. G. W. STEWART OF THE UNIVERSITY OF lOWA IS ADOPTED COMMKRCIALLY. IT LOOKS LIKE A SIMPLE LITTLE PIPE, BUT IS CONSTRUCTED ON STEWARTS NEWLY DISCOVERS THAT SOUND WAVES CAN BE MADff TO INTERFERE wflH ONE ANOTHER, CAUSING ONLY CERTAIN TONES TO BE TRANSMITTED. IT IS CALLED AN ACOUSTIC FILTER. DR. STEWART IS SHOWN HANDLING PART OF IT WITH OTHER PARTS ON • HIS DESK.

PIP t _-. ligMWfcWwHWwW .y. -i'-'VWf BHKjBE9Y^Or^iHHRMKISrI!3i£HHBMHHHHBHKSRRHB&*i£&fIHHMIIiH9i

Variometers Amrad, each -.52.00 Work Rite, each $2.49 Pioneer, each $3.00

Receiving Sets Sale Price. $28.00 Kodel Sets, 3- ... $16.00 $32.50 Kodel Sets, 4- ... SIB.OO $90.00 Day Fan, 3- ... $65.00 $175.00 Grebe, 4- $75.00 $35.00 Radiola, 2-tube $30.00 $30.00 Radiola Amplifier $22,00 Special $190.00 Operadio, ‘£-**.5127.50

KITS $65.00 Special Neutrodyne Kita. 6 tubes.s4s.oo $20.00 Special G W Low Loss Kit, 1 tube..sls.oo $40.00 Special G W Low Lots Kit, 3 tubes.s3o.oo

Clearer Louder Speakers

Tubes and Batteries for Remler Kita—‘2 frJ!

Loud Speakers $12.60 JG G H Speakers . $8.75 $15.00 Bristol < Speakers $10.50 SIB.OO Western Electric Speaker..sl2.oo $25.00 Manhattan Cabinet $19.00 $35.00 Western Electric $26.00 $25.00 Saal Speaker. $19.00 Batteries 40c 1 Mi-volt Dry Ce11...83c $2.00 22%-volt B ...$1.40 $3.75 45-volt B $2.75 SIO.OO 22^4-volt Storage B $5-00 $20.00 48-volt Storage B SIO.OO Chargers $12.50 Kodel Charger.s9.so $20.00 Kodel Charger . .$14.00 $28.00 Tungar Charger $21.00 $19.50 Bakelite $15.50 Special Duo Lateral Coils, 25 to 150. each.......50c 150 to 1,500, each....75c

5