Manuscript by German physicist Heinrich Hertz, 1888.
© Science Museum / Science & Society Picture Library
Page from 'Uber die Einwirkung einer geradlinigen Schwingung auf eine benachbarte Strombahn' ('On the action of a rectilinear electrical oscillation on a neighbouring circuit'), published in 1888. It appears to be final draft of the paper. Hertz (1857-1894) 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.