NEW GERMAN ADMIRALTY
AMSTERDAM, April 9
The German Admiralty is rapidly constructing submarines for creeping closer to the surface than the usual type, because the periscope has been abolished. Lenses and mirrors have been built into the hull on both sides to enable observations to be taken of the enemy who is unable to detect the presence of submarines until near.
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PERISCOPELESS SUBMARINES., Akaroa Mail and Banks Peninsula Advertiser, Volume LXXV, Issue 3535, 11 April 1916