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hyposcope
hyposcope n.
Brit. 
/ˈhʌɪpə(ʊ)skəʊp/
, /ˈhʌɪpə(ʊ)skəʊp/U.S. /ˈhaɪpəˌskoʊp/
[-scope comb. form, after periscope n.] Military a form of periscope for attachment to a rifle or for use as a hand instrument./ˈhaɪpəˌskoʊp/ΘΚΠ
the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > periscope (at sea) > periscope (on land)
periscope1899
hyposcope1902
trenchoscope1915
trench periscope1915
trenchscope1915
1902 Daily Chron. 16 July 9/1 The ‘Hyposcope’ competition..the peculiarity of which is that, by an optical contrivance, the marksman, completely under cover, may fire round a corner, so to speak, at an enemy.
1915 Illustr. London News 20 Feb. 236/1 A trench-periscope (or, to give it its correct name, a hyposcope)... The Hyposcope is on the principle of the camera-obscura.
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