Heinrich Hertz, German physicist, late 19th century.
© Science Museum / Science & Society Picture Library
Photogravure after a photograph by Adolf Pleser. Hertz (1857-1894) who discovered 'Hertzian waves', (electromagnetic waves) and found that they behave like light waves except for their wavelength. He was reputedly the first man to broadcast and receive radio waves and the unit of frequency of radio waves is named after him. From a collection of portraits of scientists published by Photographische Gesellschaft, Berlin, c 1910. Dimensions: 460 mm x 340 mm.