Assertion: mechanical clock | /r/HasProperty | powered by weight
Facets:
value: than by water
type: OTHER
Source sentences:
text: The early development of mechanical clocks in Europe is not fully understood, but there is general agreement that by 1300–1330 there existed mechanical clocks (powered by weights rather than by water and using an escapement) which were intended for two main purposes: for signalling and notification (e.g. the timing of services and public events), and for modelling the solar system.