The thermionic vacuum tube and its applications
A 1920 McGraw-Hill engineering treatise by Hendrik Johannes van der Bijl on thermionic vacuum tubes and their use in radio telegraphy and telephony, written for electrical engineers and advanced students. The 147 figures are line-drawn circuit schematics and characteristic-curve graphs: bold-outlined tube envelopes with filament, grid and plate, battery stacks, coils, condensers, and rheostats on plain rectangular wiring paths.
