Small periscope
1897
Tank periscope
Periscope used in the trenches
Periscope no.4
1917
Binocular bifocal periscope
Periscope in brass no.130
Periscope, French, 1900-1925
Two-power artillery periscope by C. P. Goerz
1917
Periscope for use in trenches by R.& J. Beck Ltd.
Periscopic aircraft sextant: Type 1A, No. 2053, with mount; mahogany case; steel case; cardboard box upper+lower; outside box
The Vimos periscope
1931-1941