The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . hat can resist the under-waterattack of such a weapon. These mines differradically from the observation mine in theirmethod of firing. Within a pedestal in theirupper half they carry the bared ends of the fir-ing circuit — one at the top and one at the bot-tom. This pedestal is partly filled with mer-cury, which, when the mine is tipped about 70degrees, bathes both of the bared ends of thefiring circuit, thus forming a continuous metallicconn
The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . hat can resist the under-waterattack of such a weapon. These mines differradically from the observation mine in theirmethod of firing. Within a pedestal in theirupper half they carry the bared ends of the fir-ing circuit — one at the top and one at the bot-tom. This pedestal is partly filled with mer-cury, which, when the mine is tipped about 70degrees, bathes both of the bared ends of thefiring circuit, thus forming a continuous metallicconnection, and closing the circuit. The circuitso closed heats a platinum filament which firesa primer similar to that in the observation mine. These mines also are planted in groups(Fig. 7), and have junction-boxes and discon-nectors, as do the observation mines. Untiltheir battery connections are made ashore, theyare of course harmless even when struck by apassing vessel. By plugging a diagrammatickeyboard, single mines or groups are madeeither operative or inoperative as the case maybe; but, when once the battery connections are SUBMARINE 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
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Keywords: ., bo, bookcentury1900, bookdecade1900, bookidamericanaunivers14newy
