1923 Rotogravure Wireless Radio Tuning Coil Code Typewriter Scientific Advances YNHA2 This ad is for the

This ad is for the Corp

Series Two

Clod Crusher & Leveler being sold by Duane H

Smelting and Power Company in British Columbia

or the collector of copper engravings

1923 Rotogravure Wireless Radio Tuning Coil Code Typewriter Scientific Advances YNHA2 This ad is for the"Huge Construction for Transatlantic Radio" This is an original 1923 sepia rotogravure with three images of wireless radio: the multiple tuning coil used for ocean messages at Rocky Point, Long Island being examined by F. F. W. Alendersson, the inventor of the alternator; a code sending and receiving radio; and Major Gen. George O. Squier, the Chief Signal Officer of the Army demonstrating the ease with which the radio aerial may be dispensed with by