On the Origin of Clockwork, Perpetual Motion Devices, and the Compass

Contributions from
The Museum of History and Technology:
Paper 6

On the Origin of Clockwork,
Perpetual Motion Devices, and the Compass
Derek J. de Solla Price

POWER AND MOTION GEARING	83
MECHANICAL CLOCKS	84
PERPETUAL MOTION AND THE CLOCK BEFORE DE DONDI	108
THE MAGNETIC COMPASS AS A FELLOW-TRAVELER FROM CHINA	110

Clyx.com