Practical wireless telegraphy; a complete text book for students of radio communication
A 1917 textbook by Elmer E. Bucher, published in New York by Wireless Press for students training as radio operators. Its 300 figures are heavy-line schematic diagrams — coils drawn as loops, variable capacitors, spark gaps, vacuum tubes, batteries, aerial masts and earth symbols — usable as bold technical ornament, pattern stock, or early electrical notation.
