Illustration showing Gravity driven clock:
Illustration showing Gravity driven clock: a short cylinder with a dial at one end, travels down an helical path. The pointer shows the fractions of an hour on the dial and the hour itself is indicated on the helix, 1719
Picture No
13912664
Media ID
48480439
Size
4037px x 5195px
(8.7MB)
Credit
World History Archive / Mary Evans Picture Library
Source
World History Archive





























