Assertion: semaphore's arm | /r/CapableOf | pivot at one end
Facets:
value: in the railroad semaphore
type: LOCATION
Source sentences:
text: In the railroad semaphore a single projecting arm pivoted at one end and attached to a vertical post is devised to take three positions.
text: In the railroad semaphore a single projecting arm pivoted at one end and attached to a vertical post is devised to take three positions.