Assertion: bannister's mile | /r/HasProperty | measured within a few inches
Facets:
value: by the late 1700s
type: TEMPORAL
value: routinely
type: TEMPORAL
Source sentences:
text: By the late 1700s, a mile could be routinely measured to within a few inches; watches, thanks to John Harrison, could measure 4 minutes to within 0.0009 sec (i.e. gain or lose 10 seconds a month), and after about 1750 the mass production of highly accurate watches was well underway.