Les applications pratiques des ondes électriques: télégraphie sans fil, télégraphie avec conducteur, éclairage, commande à distance
A French technical manual on practical uses of electric waves, written by physicist Albert Turpain and published in Paris by C. Naud in 1902 for engineers and students of wireless telegraphy. The plates are line engravings: circuit schematics with lettered coils, batteries, and coherers, plus sectional views of apparatus in hatched cutaway, useful as diagram vocabulary, letter-keyed labels, and hatching patterns.
