S. E. Catalogue 14 Potentiometer Catalogue No. 112 This Potentiometer is in wide commercial and amateur use. The resistance wire (300 ohms) is Glass-plate Condenser wound on a slate former. Catalogue No. 42 A Glass-plate Condenser designed for use with Spark Coils. The plates are of carefully… … Spark Coil "Amrad " Resistance Unit Catalogue No. 464 Catalogue No. 118 The "Mesco" Spark Coils, of one and two-inch I n operating quenched gaps, a suitable resistance size, are well known among amateurs as being inserted in series with the transformer primary is reliable for use in small…
Radio
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
