Pocket periscope
Contenuto
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Titolo
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Pocket periscope
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Article Title and/or Image Caption
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Description: "Pocket periscope that make possible for a soldier to look over the parapet of the trench without exposing himself to the fire of the enemy".
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extracted text
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POCKET PERISCOPE- FOR USE IN THE TRENCHES
With a new pocket periscope that has just been brought out in England it is possible for a soldier to look over the parapet of the trench without exposing himself to the fire of the enemy. The periscope is simple in construction, consisting only of two mirrors connected by a collapsible framework. Both mirrors are fixed to the framework at an angle of 45°. When the framework is extended and the upper mirror is raised above the trench, the view is reflected by the upper mirror down to the lower one, which reflects the light rays horizontally to the eyes of the observer. When collapsed, the instrument can be packed in a case 4a,4 in. square and 2 in. thick. It is 2 ft. long when fully extended.
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Lingua
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en
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Data di rilascio
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1915-06
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pagine
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836
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Diritti
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Public Domain
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Archived by
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Iacopo Tonon
Pocket Periscope