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Submarine Mines and Torpedoes; As Applied to Harbour Defence

Submarine Mines and Torpedoes; As Applied to Harbour Defence


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 Excerpt: ...current from shore increases the normal polarity of the soft iron cores, consequently when the negative pole of a firing battery is connected with "line," a current passes through the coils C C and the 1000 ohms resistance to "earth," causing the armature A to be attracted to the electro-magnet, and thereby shunting a current through the fuzes to "earth," the resistance on the fuze circuit being low enough to cause the mine to be exploded. Firing by Contact.--On the other hand, if it be desired to fire by contact the negative pole of a weak but constant battery (a few Daniell's cells) is connected to "line," and when the circuit-closer is struck, the armature is pulled up mechanically and retained in that position magnetically. The signalling battery gives a signal on shore and the firing current can now be switched to line or not as desired, the mine struck being indicated at the firing station by a deflection on a galvanometer, and by causing an electric bell to be rung in a manner to be described hereafter, when the arrangements on shore are examined. Only one mine with a detached circuit-closer arranged in this manner can be put on one core. Electro-Contact Mines.--When, however, the apparatus is employed in electro-contact mines, pure and simple, the "earth" wire from b through a 1000 ohms coil is omitted. Several mines, say six or seven, can then be connected with one core or single cable, either in a string, one after the other, or on fork (see Figs. 60 and 61). In the former case connecting boxes, as shown in Pig. 50 (see page 106), are used; in the latter a junction box, about to be described. When any mine on a group is struck, the weak current battery in the firing station holds up the armature an...


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Product Details
  • ISBN-13: 9781235972003
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 90
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1235972003
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 177 gr


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