Assertion: periscope | /r/HasProperty | instrument
Facets:
value: for observation
type: PURPOSE
value: for observation from a concealed position
type: PURPOSE
Source sentences:
text: A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position.
text: The periscope is an instrument for observation over, around or through the object, obstacle or condition that prevents direct line-of-sight observation from the observer
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.
text: A periscope is an instrument people use to look at things from a hidden position.
text: A periscope is an instrument for observation from a concealed position.
text: A periscope is an instrument for observation from a concealed position.