Mine-and-Box.jpg
Summary
This image is taken from Training Manual TM 2160-20, "Submarine Mining," U.S. War Department, Washington, D.C., October 15, 1930, p. 217. It shows a spherical mine (cylindrical ones were also used) tethered to an anchor which kept it at a pre-determined height above the bottom. The mine is connected to a distribution box, a brass connection box weighing 300 lbs and providing protection for connections between the "shore cable" (running to the on-shore mine casemate) and the cables to the 19 mines that made up a mine Group. The buoys marking the mine and the distribution box were used during planting, and could also remain attached to the mines and equipment during service, at the discretion of the local commander. A typical distribution box had almost three miles of single-conductor cable running from it to the 19 individual mines of its Group.
Licensing
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This work is in the
public domain
in the United States because it is a
work prepared by an officer or employee of the United States Government as part of that person’s official duties
under the terms of
Title 17, Chapter 1, Section 105
of the
US Code
.
Note
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U.S. state
,
territory
, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the
United States Postal Service
since 1978
. (See §
313.6(C)(1)
of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see
The US Mint Terms of Use
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