Assertion: telescope's objective | /r/HasProperty | mounted on swiveling ball-joint
Facets:
value: on top of an adjustable mast
type: LOCATION
Source sentences:
text: The objective was mounted on a swiveling ball-joint on top of a pole, tree, or any available tall structure and aimed by means of string or connecting rod.
text: In the Huygens' "aerial" telescope the objective was mounted inside a short iron tube mounted on a swiveling ball-joint on top of an adjustable mast.