Assertion: periscope | /r/MadeOf | tube
Facets:
value: with mirrors
type: OTHER
value: at a 45-degree angle
type: MANNER
value: at each set
type: OTHER
Source sentences:
text: The periscope is an instrument for observation, It consists of a tube with mirrors at each set parallel to each other at a 45-degree angle, with the addition of two simple lenses, and it depends on the occurrence of regular light reflection on the plane mirrors.