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.RADIO BROADCAST ADVERTISER. of the Single Source DANGEROUS? All your eggs in one basket? Or have you found from experience that, like every- thing else, it depends upon just who the Single Source of Supply happens to be. Any radio manufacturer who has a season's contract with Dongan has a season's insurance — on a quality product, delivered as promised. There will be no halts, no delays in the production line, nor rejected sets nor amplifiers because of an inferior run of transformers. Year after year the list of those whom Dongan serves as a Transformer Source, is augmented by a few more of the larger and better manufacturers. Those of you who seek such a satisfactory source for the coming season are invited to make use of our Engineering facilities for experimental work — now. Transformers Chokes Condenser Units Complete Parts for construction of Amplifiers for theaters, dance halls or public address systems Dongan Electric Manufacturing Co 2991-3001 Franklin Street 10,000s*. WWWAW 100,000^. 100,000 .n. WkWVWA*. 100.000 A\ 'VWWVXVWU 200,000 fL VOLTS - 15 150 300 7SO (Si (g) A Voltage Multiplier The Super Akra-Ohm wire-wound Resis- tor is especially adapted for use as a Voltage Multiplier as shown in the above diagram. It is carefully designed to in- sure an accuracy of 1% and a constant permanency of calibration. Its use is also highly recommended for Laboratory Standards, High Voltage Regulators", Telephone Equipment, and Television Amplifiers and Grid and Plate Resistors, etc BULLETIN 62 contains the first complete chart for the use of accurate resistors with microammeters and milliammeters. Send for your copy today. There is no obligation. Detroit Michigan ULCO" covers are used by those dealers who realize the importance of making de- liveries in perfect condition - - without scratches or mars. For they know that com- plaints mean dissatisfied customers and loss of business. "FULCO" covers are a real service feature that helps sales and holds trade. Substantially constructed, heavily padded, box-Hhaped, providing perfect protection. Give UH the dimensions of radios handled and let UH quote special prices on your in-> dividual needs. Write our nearest house. MODEL 489 D. C. PORTABL1 THREE-RANGE VOLTMETE1 750 - 250 - 10 Volts 1000 Ohms per Volt Resistance A STURDY, miniature instrument, •**• suitable for home or laboratory use-—popular because of its small size and unusual electrical characteristics. A truly professional instrument, with all the niceties of design and construc- tion which make a "Weston" so desir- able. Solid black bakelite case, convenient pin jacks, and test cables equipped with pin terminals for insertion in the jacks. Reasonably priced. Weston Electrical Instrument Corp. 604 Frelinghuysen Ave., Newark, N. J. WESTON RADIO INSTRUMENTS D E C E \I H F. K 1 Q 2 Q