File:Notes on torpedoes, offensive and defensive (1872) (14582254670).jpg

Identifier: notesontorpedoes00stot (find matches)
Title: Notes on torpedoes, offensive and defensive
Year: 1872 (1870s)
Authors: Stotherd, Richard Hugh, 1828-1895. (from old catalog)
Subjects: Torpedoes Submarine mines
Publisher: Washington, Govt. Print. Off.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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entirely designed byQuartermaster-Sergeant J. Mathieson, E. E., is a very effi-cient piece of mechanism. While possessing sufficientsolidity of construction to resist external injury, it hasproved itself so sensitive that a very slight blow will put itin action, and though it is possible that improvements mayhereafter be made in it, or that other forms of circuit-closersmay be designed, there is no doubt that it might be at onceused with success in connection with any system of subma-rine mines. MathiesonM cir- Another similar apparatus, differing however in its modeof action, has been designed by Quartermaster-SergeantJ. Mathieson, E. E. Iu it the current is allowed to circulatecontinuously, and the effect of a blow is, for an instant, tointerrupt the electrical current with a corresponding cessa-tion of the current; it is easily understood how this cessationof current would convey a signal to the testing-room, andhow it might, by means of a relay, be made available for cuit-breakei
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209 throwing a firing-battery into the main circuit. From itsmode of operation it has been called a circuit-breaker. Its general arrangements are shown in Fig. 87; (a) is a Construction ofbrass casting, forming the base of the instrument, with aprojecting rim to supply the place of the feet in the originaldesign; (6) is a brass dome similar to that already described;(c) is a disk firmly attached to a steel rod (d ;) the center ofthis disk is composed of ebonite to insulate it from the rod,while its outer portion is of brass as before; (e) and (I) arethe earth and line wires arranged for introduction into theapparatus by means of an ebonite screw-piece (&;) (h) is acylindrical ebonite block, shown also in plan, to which areattached four strong brass springs (/, /, /,/) projectingdownward somewhat below the level of the disk (c,).andin such a position that any deflection of the rod carryingthe latter would bring it in contact with the springs andpress them outward. The lower portion

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