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RADIO BROADCAST ADVERTISER 223 is everything in radio soldering says this Radio Engineer "In our laboratory we made a thoro analysis of the two groups of fluxes (natural and chemical). We found the natural flux, rosin, the only safe one to use on radio work. Pure rosin, as in Kester Radio Solder, will not fume, sputter, or creep over large areas, and being a hard, dense substance, rosin will not attract and collect dust (car- bon particles), which makes an excellent path for leakages. These are the faults of fluxes containing chloride, be it either in paste, liquid or compound form. Any flux containing chloride will eventually cause heavy leakage. Hence they should be strictly avoided. We find Kester Radio Solder the most convenient way to solder on radio work, for it has the proper amount of pure rosin right inside the solder itself. In fact, we used it exclusively on all of our work." There's your guide, radio fans— the approval of an expert radio engineer. Surely there can be no doubt as to what you should use on YOUR SET. A free Sample 'Writefor it now KESTER Radio * SOLDER the safe solder for radio, requires only heat CHICAGO SOLDER CO. 4*3* Wrightwood Ave. Chicago, U. 8. A. Originators and the World's Largest Manufacturers of Self-fluxing Solder METALLIZED WARRANTED FIXED RESISTORS THE vital importance of a silent, accurate resistor cannot be over- estimated. Comprising a concentrated metallized deposit one-thousandth of an inch thick, upon a glass core and sealed forever within the tube, each Lynch Resistor is warranted absolutely noiseless, permanently accurate, dependable! Guar- anteed accuracy — 10%; in production they average 5%. .25 ; .5 ; 1 ; 2; 3; 4; 5 ; 6; 7; 8; 9; 10 Meg., 50c. .025; .09; .1 Meg., 75c. Single mounting 35c; Double, 50c. If your dealer cannot supply you, send stamps, check or money order. We ship postpaid same day order is received. Dealers— Qet on our mailing list; vie Jceef) you fasted on •fa new developments. Write us todayl 426-B 250 W. 57th St. New York, N.Y. AD -rut ID LYNCH, INC. Make Your Set Safe With a Belden Fused Radio Battery Cord T7OR a perfect Radio Christmas, protect the new tubes and batteries, and also avoid fire hazard from crossed wires by hooking up your set with a Belden Fused Radio Battery Cord. The tiny A and B battery fuses, concealed in the little two- piece bakelite shell, can be easily inspected. This handy cord also improves the appearance of the set and eliminates all loose wires. For maximum range and vol- ume, ask your dealer for a Bel- denamel AeriaL It cannot cor- rode, even after years of service, and requires no cleaning. Belden Manufacturing Co. 231ZA S. Western Ave., Chicago, Illinois Ask your dealer for a Belden Fused Battery Cord. -M . •* nt mis is a Radio Christmas Examined and approved by RADIO BROADCAST