FEBRUARY, 1924 25 CENTS AM (Reg. II. S. Pat. Off.) v www.americanradiohistory.com ,1 of the /44-44 ;5000 indowTrim Contest held during National Tube Week September 24`h to October 1. 1923 :wood!: ulil---_,,_ t CUNNING r Ilçp HAM TUBES (: n r The Judges for the Cunningham 5,000 Window Trim Radio Tube Week, Contest held during Cunningham National September 24th to October 1st, 1923, have after due deliberation, from and unbiased viewpoint, allotted the fifty -one prizes a disinterested tie for sixth place. as stipulated in the rules of the contest, declaring a Following are the names and addresses of the Radio Dealers who and the manner in which the prizes were awarded: shared in the awards Lester's Radio Shoppe, There being a tie for sixth place, the same Los Angeles, Calif. $1000 prize has been -First Prize allotted to Hennepin Hardware Company, the two dealers Pparticipating P 9 in the tie, increasing Minneapolis, Minn. 750 -Second Prize the total amount of the prizes from $5,000 to $5,100. Electrical Appliance Shop, Los Angeles, Calif.. 500-Third Prize Geo. C. Wille & Company, Warner Hardware Company, Minneapolis, Canton, Ohio $100 -Sixth 1 Minn. 250- Fourth Prize Hook Drug Company, (`Tie Pincus & Murphey, MINN Indianapolis, Ind 100-Sixth J Alexandria, La 150-Fifth Prize r:u, $50 HONORABLE MENTION The forty-five prizes as stipulated in the rules of the Contest are awarded to the following Cunningham Tube Dealers for windows of Honorable Mention: Radio Banister & Pollard Co., Lindemann Auto & Machine Co., Newark, N. E. M. Sargent Co., J. Enderlin, No. Dak. Oakland, Calif. W. E. Berry -Radio, Louis D. Rubin Elec'1. Co., Inc., Waco, Tex. Selby & Reed, Charleston, S. C. Martins Ferry, Ohio. Jesse C. Cutler, Mason, Pyle & Parkhurst Radio Co., Brookings, So. Harry H. Smith, Dakota. Webster City, Ia. Decatur, Ills. Ehrler Radio Co., Mid-Continent Radio Corpn., Chicago, Ills. Southern Pbg. & Elec. Co., Ft. Worth, Tex. Taylor, Tex. Equipment Sales Co., Midwest Radio Co., Stoehrer's San Diego, Calif. Electric Shop, Kansas City, Mo. Oxnard, Calif. Erviñ s Electrical Co., Murphy Maclay Hardware Co., Parsons, Kans. H. C. Tafel Co., Great Falls, Mont. Louisville, Evers Hardware Co., Ky. Newark Radio Supply Co., The Broadcast Shop, Denton, Tex. Newark, N. J. Fortner Camera Supply Washington, D. C. Co., Oscar A. Huelsman, The Brown Pharmacy, Sterling, Colo. Fond du Lac, Wis. C. Chanute, Kans. H. Gilliam's Radio Store, Paramount Radio & Elec. Co., Brownwood, Texas. The Motor Supply Co., Atlantic City, N. J. Seattle, Wash. Robert A. Goodall, H. Y. Parrott, The Ogallala, Nebr. Radio Distributors, Dennison, Tex. Long Beach, Calif. Thos. J. Green, Pfahl Electric Co., Winona, Minn. The Selzer Electric Co., Cleveland, Ohio. Cleveland, Ohio. Haskell Electric Co., Prest Electric Co., Holyoke, Mass. Thibaut & Mentz Bros., San Bernardino, Calif. Marion, Ohio. Lazar & Son Music Center, P. S. Radio Service Co., Chicago, Ills. Weed's Radio Shop, Cleveland, Ohio. Portland, Ore. Long Beach Radio Shop, QST Radio Shop, Long Beach, Calif. Willapa Electric Co., Tacoma, Wash. Raymond, Wash. H. Lesser & Company, Radio Sales & Repair Co., Cleveland, Ohio. Wolf Electric Co., Cleveland, Ohio. Beaver Falls, Penn. We take /!; YOURRAO/O Sin this occasion to extend our deep appreciation to There A all over the country who the thousands of Radio Dealers located Difference so whole -heartedly entered into the contest and while many of them did off one of the prizes they nevertheless have placed themselves not carry their respective in the front ranks of live Radio Dealers in localities and have the hearty co- operation and earnest support of this organization. Home Officer 182 Second St. 154 West Lake Street San Francisco, 30 Church Street Calif. Chicago, Illinois New York City, N. Y. www.americanradiohistory.com RADIO for FEBRUARY, 1924 Model X $285, Fully Equipped With Built -in Loud Speaker This radio receiving unit is a newly perfected development of the Kennedy Engineering Staff. It is unusual in that it combines ex- treme simplicity of operation with the same scientific accuracy and selectivity that char- acterized the earlier Kennedy models. After an initial setting is made only one dial is re- quired for all tuning. And, when a dial set- ting of a station is once determined, that station will always "come in" at its own set- ting regardless of where the receiver is used. It is stable in operation, reproduces music and voice with remarkable faithfulness and has established some unusual distance records. Responds to all broadcast wave- lengths- operates on any antennae, outside type pre- ferred. "Re- radiation" has been practically eliminated. I: eautiful 1" adio Furniture o the New Kennedy eceiver, Modell X . 0 As a graceful piece of furniture, the Ken- where recognized as one of the most note- nedy Radio Receiver, Model X, makes a worthy achievements in radio develop- charming addition to any home. The ment-particularly since it sets a new cabinet is of mahogany, hand rubbed to standard of operating simplicity in corn - a beautiful finish -with its delicate inlay bination with the precision and selectivity of satinwood and ebony and the grill at that have always been a feature of Ken- the front, it is truly typical of the Sheraton nedy radio receivers. design. A loud speaker of superior qual- The price of Model X, completely equipped ity is built into the cabinet-by this with all tubes, dry batteries, built -in loud means faithful reproduction of music and speaker and individual Kennedy 3,000 - voice is available to an entire family or ohm phones, with plug, is $285.00. Other assembly of guests. models range from $125.00 to $825.00, The control panel is symmetrically bal- completely equipped. anced and immediately indicates the re- Ask your dealer to show you the new Ken- markable ease with which the receiver nedy Radio, Model X, or write us direct may be operated -the angle at which it is for fully illustrated literature. set is the result of much study to provide THE COLIN B. KENNEDY COMPANY greater comfort while tuning. St. Louis San Francisco 411 Kennedy receiving .rel.r are regenerative. The receiving unit in Model X is every- Licen.red under drm.rtrong U. S. Patent No. 1.113.149. KENNEDY.%:. \ .. f Jadio Tell them that you saw it in RADIO www.americanradiohistory.com RADIO for FEBRUARY, 1924 Forecast of Contributions for March Issue Og D. B. McGown has two fine articles. One gives the constructional details of "An Ideal RADIOEstablished 1917 Pacific Short Wave Regenerative Receiver" which he as Radio News has just built. The other tells how nickel plating is done. ji Volume VI for February, 1924 Number 2 Paul Oard continues his Radio Construction Pointers with some good ideas on condensers, switch points and knobs, panels, and soldering. He also tells how to make a single tube reflex CONTENTS for FEBRUARY, 1924 receiver. ji Don Lippincott has some good advice on "Sensitive Receivers." Radiotorial Comment 9 ji Clearing the Trans -Atlantic Shipping Lanes by Radio 10 Maurice Buchbinder presents a handy chart By S. R. WINTERS of inductance and capacity values corresponding to any wavelength 'from 100 to 1000 meters. A Four -Electrode Tube Receiver, By BROOKE SAWYER 11 ji A Remarkable Receiving Set, By S. G. MCMEEN 13 John F. Rider describes the construction of a Filter Functions and Construction, By FLORIAN J. Fox 14 selective receiver designed for 80 to 220 -meter reception with a minimum of tuning controls. Some Sidelights on the Reasons for Interference, By JESSE MARSTEN 15 This should be of especial -value to the amateur operator. Causes of Interference and Its Remedy, By ALFRED E. BANKS 17 j One Pushee, One Pullee, She Workee Like Helle; By E. W. KERSTEN 19 The fiction feature is a real radio story, "To An Efficient Coil Winder, By E. B. WHIGAN 20 Sea or Not to Sea ", by Preston D. Allen, an old - time operator. The Jinx of the Bobolink, By VOLNEY G. MATHISON 21 ji An Efficient Low Wave Regenerative Tuner, By CHARLES BRUERE, JR 23 S. G. McMeen tells how to make a winder for -honeycomb coils. How To Tune a Honeycomb Coil Set, By PAUL OARD 27 ji Window Dials for Radio Sets, By E. H. SWANSON 28 Florian J. Fox discussesji "Modulation ". Radio Construction Pointers, By PAUL OARD 29 Edward T. Jones treats of "Misconceptions of Metal Lacquering, By D. B. MCGowN 30 Radio ". j The Ultra -Reinartz Receiver, By JACK WARD 31 Alexander Maxwell gives some interesting An Adjustable Fixed Condenser, By CHAS. F. FILSTEAD 32 facts on the condenser loop. Some Principles of Amplifier Tube Operation 33 ji By MAURICE BUCHBINDER W. S. Thompson, Jr., has written some helpful "Notes on Distortitinless Amplification ". Naming The Receiver Circuits, By C. W. RADOSLOVICH 35 ji Beware the Radyonatic, By RAY Dio 36 Charles F. Filstead has an article on "A Re- Querries and Replies, By G. M. BEST 37 flex Receiver for Beginners ". News of the Broadcasters 39 ji Letters To The Editor 39 P. J. Townsend gives the details of the "super - autodyne" circuit. News of the Radio Amateurs 40 ji Calls Heard 41 F. L. Allrich describes a motor buzzer trans- mitter. New Apparatus and Supplies from the Radio Manufacturers 42 ji M. Wolf has an article on "Tone Transmis- sion for Amateurs ". RADIO is Published Monthly by the Pacific Radio Publishing Co., Inc., Advertising Contests Award Pacific Building, San Francisco, Calif. The judges of the advertising contest an- ARTHUR H. HALLORAN Editor nounced in the February issue have selected the LAWRENCE MOTT Associate Editor letters written by the 'following as the winners: GERALD M.