Assertion: periscope | /r/HasProperty | optical instrument
Facets:
Source sentences:
text: A periscope: An optical instrument that uses a series of prisms, lenses and mirrors to reflect images through a tube.
text: A periscope is an optical device that allows an observer to see things beyond his or her line of sight.
text: A periscope is an optical instrument that allows objects that are not in direct line of sight to be viewed.
text: A periscope is an optical instrument that is used to watch a scene from cover.
text: A periscope is an optical instrument that uses a system of prisms, lenses, or mirrors to reflect images through a tube.
text: A periscope is an optical instrument that uses a system of prisms, lenses, or mirrors to reflect images through a tube.
text: A periscope is an optical instrument that uses a system of prisms, lenses, or mirrors to reflect images through a tube.
text: A periscope is an optical instrument that uses a system of prisms, lenses, or mirrors to reflect images through a tube.
text: Periscope, optical instrument used in land and sea warfare, submarine navigation, and elsewhere to enable an observer to see his surroundings while remaining under cover, behind armour, or submerged.
text: A periscope is an optical device for conducting observations from a concealed or protected position.
text: A periscope is an optical device that allows an observer to see things beyond his or her line of sight.