Go back to article: Chronometers, charts, charisma: on histories of longitude

Figure 6

A page of pen and ink notes and sketches relating to longitude observation using a telescope from 1788

‘One of my methods for discovering longitude’: in 1788 a Shetland schoolmaster, John Tulloch, sent the Board of Longitude this scheme to enable simultaneous telescopic observations from a ship of stars and the Moon.