The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . I. The Protector in cniising trim. 2. The Holland Boat ai I SUBMARINE NAVIGATION made, the mine becomes its own lookout, andshould an enemys ship make the fatal mistakeof bumpnig against it, the mine will do itsdeadly work without further aid. Automatic Mines.— The electro-mechanical(Fig. 6), electro-chemical, or automatic mine,as it is variously styled, is by long odds the. fighting ships of a number of nations, called thenaval defense mine.
The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . I. The Protector in cniising trim. 2. The Holland Boat ai I SUBMARINE NAVIGATION made, the mine becomes its own lookout, andshould an enemys ship make the fatal mistakeof bumpnig against it, the mine will do itsdeadly work without further aid. Automatic Mines.— The electro-mechanical(Fig. 6), electro-chemical, or automatic mine,as it is variously styled, is by long odds the. fighting ships of a number of nations, called thenaval defense mine. These mines are in-tended to protect a hastily established navalbase on the enemys coast or at some point nototherwise defended. They differ from the ordi-nary electro-contact mines only in the absenceof a shore-battery connection. After thesemines are planted and the mine-laying vesselor boat is at a safe distance, a small battery,in a water-tight case and connected by a numberof yards of small, insulated cable, is thrownoverboard; and then-—and then only — themine becomes dangerous to any craft hitting recover these mines in safety, the battery-boxes are swept for, raised, and disconnected,after which the mines themselves may be re-covered without danger. Mines of this sortcan be laid and recovered very rapidly, evenduring the heat of action; and, by an ingeniousarrangement, they are made self-anchoring at apredetermined depth. Counter-mining.—Counter-mining is the work Fig. 8.—A. Mine System on Singl
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