The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . Fio. 3.—Observation Mine. and the most powerful of the defending ord-nance. First and Second Lines.—To accomplish this,submarine mines of various sorts are plantedthroughout the waters leading to a fortifiedposition. Ry thus covertly guarding the flankingavenues of approach, it is possible to bring tobear upon an enemy a superior force at thepoint of attack. To this end, the navigable. Fig. 4.—Junction-Box of Mine System. of an active enemy ;
The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . Fio. 3.—Observation Mine. and the most powerful of the defending ord-nance. First and Second Lines.—To accomplish this,submarine mines of various sorts are plantedthroughout the waters leading to a fortifiedposition. Ry thus covertly guarding the flankingavenues of approach, it is possible to bring tobear upon an enemy a superior force at thepoint of attack. To this end, the navigable. Fig. 4.—Junction-Box of Mine System. of an active enemy ; and for this purpose lighterbatteries of rapid-fire guns and searchlights areinstalled to sweep all avenues of approach, andeffectually to repel the small craft, to whomsuch work is generally entrusted by the aim is not only to destroy all vessels at-tempting this work, but to hold such craft ata distance so that they shall not be able evento locate the position of the mine fields; forit is in the secret, hidden nature of such de-fenses that their moral force lies, even morethan in their applied destructive power. Systems of Planting.— The work of plantinga mine field involves no little preparation, for,as must be understood, the modern mine israther complex in its installation in the fair-ways of commerce; and, of course, the idea to-day is to provide an eflirient defense while stillleaving the clinnnels of traffic open to free pas-sage during daylight and at such other times asmay be secure fnim an enemys approach
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