trenchoscope
/ˈtrɛn(t)ʃəskəʊp/Now historical
noun
= trench periscope. Compare slightly later trenchscope.
- Chiefly with reference to a model of trench periscope manufactured by Adams & Co. (a London manufacturer of photographic apparatus) in 1915..
Origin
Early 20th century; earliest use found in The Times. From trench + -o- + -scope.