Signalling through space without wires : being a description of the work of Hertz & his successors
Oliver Lodge's technical account of Hertzian waves and early wireless telegraphy, printed in London in 1900 by "The Electrician" for physicists and electrical engineers. Line engravings show spark gaps, Leyden jars, resonant loops, coherers and induction coils, drawn as spare outline apparatus floating on cream paper with dotted ray paths and single-letter labels.
