BSTJ 1: 2. November 1922: Application to Radio of Wire Transmission Engineering. (Espenschied, Lloyd)
A technical paper by Lloyd Espenschied in the Bell System Technical Journal, published in New York in November 1922 for telephone and radio engineers. Illustrations are line-drawn attenuation and gain graphs on ruled grids, with hand-lettered frequency labels, plus a block-and-circuit schematic pairing modulator and detector chains with frequency-band diagrams.
