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‘frequency’ historical pictures (exact matches)
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Modern Wonders, 1938: A 500,000, Volt Flash
'Jedi' helmet, used with Cryogenic Magnetic Resonance Imaging Machine
This Mechanized Age, 1937: Electric Melting Furnace
Nikola Tesla, with his equipment for producing high-frequency alternating currents
Storm Tracks and Frequency, World
D'Arsonval with his high frequency apparatus
The treatment of malignant tumours by electrical currents
Illustration for Animal Mechanism, A Treatise on Terrestrial and Aerial Locomotion