Radio mirror (Jan-Oct 1923)

RADIO DIGEST — Illustrated September 20, 1923 RADIO FOR EVERYBODY (Continued from page 11) ened and not nearly so strong as when the outfit was outside of the steel box. Were the steel walls to be increased to ten feet in thickness it is doubtful whether Radio waves would get through. Another property of ether that should be brought out is the fact that, no matter what the lengths of either Radio or light waves, their speed forward is 186,000 miles per second, which is seven and one-half times the circumference of the earth. Wave Motion The propagation of a wave motion forward can be accomplished in two ways, Figure 2c — The "side-to-side" method of wave travel through the ether and it seems very likely that Radio utilizes both of them. The ether must be composed of very small particles much as is oxygen or water, as otherwise it would not be capable of carrying wave motion. Normally these small particles would appear as in Figure 2a. One method of wave travel is as shown in Figure 2b and this is known as the "compression" method. From point 15c Lettered binding posts, complete, set eight, 60c; two sets, $1.00. Prepaid, same day. Stamps accepted. Everything in Radio. Ask for quotations. List for stamp. Kladag Radio Laboratories, Kent, Ohio. WD-11 and WD-12 Tubes Repaired WD-11 or WD-12 $3.50 C-300 or UV-200 2.75 C-30I or UV-201 3.00 C-302 or UV-202 3.50 C-301A or UV-201A 3.50 Moorehead Detectors 2.75 Moorehead Amplifiers 3.00 DV-6 or DV-6A 3.00 Also the new UV-199 3.50 NEW DX 1 yz VOLT TUBES . 4.00 All tubes guaranteed to work like new Mail Orders Given Prompt Attention "24 Hour Service" RADIO TUBE CORP. 55 HALSEY STREET NEWARK, N. J. Tubes Sent Parcel Post, C. O. D. A to point B, the particles are all pressed together, as they are also from point C to point D. Between the waves or from B to C, however, they are abnormally far apart. In Figure 2c we see a graphic presentation of the "side to side" method. Here the small particles are caused to swing to one side of their normal position, back through normal, and out to the opposite side of normal. In this diagram we have wave peaks at B, D and F Radio may utilize either of these methods but due to the fact that, as will be shown later, a Radio wave is made of two components, it appears very probable that both systems of wave motion come into action. (TO BE CONTINUED) Old Tube Used as Guide Did you ever wire a set and then find that some wire was too close to or just over the tube socket? If so, you'll appreciate this suggestion. If you have a burned out tube or can get one, use it as a guide. When you wire a socket, put the tube in the socket. Tou can'i hurt it if the pliers or the iron slips and you have a guide to keep wires properly spaced.— Guy M. Chase, Elizabeth, N. J. COPPER: Strip l/16"xl", per ft., 45c. for switches, etc.; foil, .001"x4", per ft., 10c, 10 ft., 80c, for condensers, etc. Post extra on orders under $1.00. L. D. SEAVER, 341 Piedmont St.. WATERBURY, CONN. YouDon'tNeed T««fc^C{to get out of town. If you * MVV»want new stations on your crystal set WRITE ME TODAY. Mine works 400 to 1,000 miles without tubes or batteries ! Thousands have bought my plans and now get results like J^eCHANGES OFTEN COST LESS THAN A DOLLAR. Send self-addressed envelope for further information. Leon Lambert, 501 South Volutsia. Wichita. Kansas. _ TWO SUPERSENSITIVE CIRCUITS (Beth Copyrighted) My Highly Improved Reinartz brings in all important stations on both coasts and Mexican border, loud, clear and without distortion. We dance to music from Atlanta received on one loud Baldwin unit. Build one of these wonderful sets from my blueprints and specifications, price 50c, or with a perfect and complete double wound spiderweb coil, $3.00 by mail. No other windings used. Photo of my set oh a glass panel with every order. This copyrighted circuit is the most successful of any Reinartz modification yet produced, and is imitated the most. Thousands are in use. My W. D. 1 1 Circuit is especially designed for use with the "Pickle" tube and brings out the full value of that little tube as no other circuit can. Stations 1000 miles away come in clearly on one tube. This set is small, complete, portable. For the man who wishes the highest efficiency, this is tie set to build. Price of blueprint and specifications, 50c, or with complete and perfect windings, $3.00. Photo of set with every order. Sets built from these plans will receive all broadcasting stations operating under the new laws. Their wave length range is from 170 to 800 meters. AUXILIARY TUNER This new instrument connected to your present receiving set with one wire enables you to easily bring in both the long and short wave stations which you cannot get with your present equipment. It also enables you to eliminate that local interference so you may listen to distant stations. Copyrighted diagram and complete instructions for building and operating this instrument, 50c. or with all parts, including Condenser. Coils, Switches. and Panel, §8.50. Complete instrument, $15. All goods prepaid. These instruments are easy to build, easy to operate. Everything clearly shown. S. A. TWITCHELL 1925 Western Avenue, Minneapolis, Minn. pillllllllllllllll!!III!llll!l!IIUII!IIIIS!!EIIiH;!£S!III!i!S;SISEIlI!in!IIimi!IISMIIIIEIl!!lEIIIIII| "MAKE Perfection I2H5 Selection' Neutrodyne 5 TUBE SET The Neutrodyne Circuit is the last word in Radio and is the best set that can be made today. Formica Panel 7x24 5 Bakelite Sockets 3 Neutroformers 2 Neutrodons 2 Franco Audio Transformers 1 "A" Battery Switch 3 Dials, 4 inch 1 Klosner Rheostat 1 Amsco Power Rheostat 8 Binding Posts with Names 3 "fucks 27 Feet Spaghetti 28 Feet No. 14 Tinned Copper Wire 2 Condensers, .006 Dubilier 1 Grid Leak and Condenser, Freshman 1 Dubilier Condenser, .002 Special price for complete parts for 5 tube set Cockaday Circuit Complete 1 Eastern Cockaday Coil 2 Amsco 23 Plate Vernier Condensers 1 Panel 7xl4x& 2 Dials, 3 inch 1 Bakelite Socket 1 Tubular Leak, 2 meg. 1 Dubilier Condenser, .00025 1 Klosner P.beostat 8 Name Binding Posts 12 Feet Tinned Copper Wire No. 14 6 Feet Cambric Spaghetti 1 Switch Lever 7 Contact Points and Nuts 2 Contact Stops and Nuts 1 Diagram Our special price for complete Cockaday Set Erla Reflex Circuit Complete Operate a loud speaker on one tube with this wonderful set. 1 Formica Panel 7xl4xi&. Panel is drilled, engraved and polished. 1 Erla Beflex Transformer. 1 Pcarlco Moulded Bakelite Coupler. 2 Switch levers. 1 Amsco 23 Plate Vernier Condenser. 1 Klosner Vernier Rheostat. 1 Crystal Detector with Crystal 2 Bakelite Sockets. 1 Dial. 3 inch. 1 Improved Jack. 1 Dubilier Condenser .001. 1 Dubilier Condenser .002. 1 Erla Bezel. 5 Name Binding Posts. 12 Ft. Tinned Copper Wire. No. 14. 6 Ft. Cambric Spaghetti. 12 Contact Points and nuts. 2 Contact Stops and nuts. 1 Franco Audio Transformer. Our Special Price Complete $ 27^ Perfection Radio Corporation 59 Cortland Street, New York City Six New York Retail Stores Add Parcel Post Do Not Send Stamps 208 page complete Radio catalogue free with order of $5.00 on request. Otherwise prepaid for 25 cents. MILOPLEX NEW CIRCUIT (Continued from page 10) voltages of B battery for your detector. If you are going to use dry cell tubes your potentiometer should be around 1600 ohms; a 200 ohm one will do for storage cells. Supper is ready; my better %ths Is calling. I have just answered — "in a minute" — so I will take that last minute to tell you something about aerials. No aerial is better than its ground; if you have a good ground get a better one; put on two, keep piling grounds on, the more the better. Let's eat! Making a Good Ground Gas pipes are poor grounds, due to insulating joints at the meter. Water pipes are often a long way and a crooked way from the set. If the set is connected to the gas pipe in the room where the set is, with a good ground connector and if a connection is made in the bath room or PATENT ATTORNEYS PATENTS. Booklet free. Highest references. Best results. WATSON E. COLEMAN, Patent Lawyer, 624 F Street, Washington, D. C. elsewhere from the gas pipe to the water pipe, using large wire and ground clamps on the pipes, you have a water pipe ground without a long and crooked wire running from the set to the water pipe. —Guy M. Chase, Elizabeth, N. J. Much of the troublesome "static" can be avoided during the summer months if the right circuit is employed and the aerial shortened. Harrison Radio Bargains Electric Soldering Iron $2.25 Long Distance Headphones, $7.00 value. 3.39 Lightning Arresters, glass mounting... .85 Variocoupler, $4.50 value 3.75 Variocoupler. $3.50 value 2.40 Variometers, $3.50 value 2.40 11 plate Vernier Condensers 3.58 23 plate Vernier Condensers 3.?8 43 plate Vernier Condensers 4.18 50 Mile Range Crystal Sets 1.S8 Send Money Order or Check to HARRISON RADIO SUPPLY CO. 74 W. Harrison St. Chicago, 111 Imimimmiiiiiiiiiiiiiiiiiiiiiiiimimmmiiitmiiimiiimiiiimmiiiiiiiiiimiimmii;! 3,600,000 Radiotrons Radiotron UV-201-A $6.50 Radiotron UV-199 $6.50 already made and sold ! This one fact reveals at a glance the growth of radio! 3,600,000 RADIOTRONS already sold! It was the perfection of the RADIOTRON that made popularisation of radio possible — and every vacuum tube set needs RADIOTRONS for clear reception and amplification — for sensitivity — and long distance reception. Radio Corporation of America Sales Depl. Suite 3002, 233 Broadway, New York District Sales Offices: 10 South La Salle Street 433 California Street Chicago, 111. San Francisco, Cal. Radiotron WD-11 $6S0 Radiotron WD-12 $6.50 Radiotron UV-200 $5.00 Radiotrons REG U. S. PAT. OFT. RADIO «^IP> FANS! Your Reliable Road from COAST to COAST in SUMMER CONTINENT to CONTINENT in WINTER is via THE ACMEDYNE CIRCUIT as employed in the MELCO SUPREME Tuned Radio Frequency Receiver This set operates with and without Loop, Aerial and Ground ESSENTIALS Amsco Compensating Condenser BUILD ONE YOURSELF All parts complete with Cabinet, Drilled and Engraved Panel Ready for Assembly Telos Variometer and Variotrans former AMSCO PRODUCTS, Inc. Broome and Lafayette Streets NEW YORK N. Y.