. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. osion, the magazine must be turned so far round as tolet fall a portion of the percussion powder into the pan; after which it is turned back,and the steel punch recovers its proper position for striking another blow into thepan. The invention of the copper percussion cap was another great improvement upon thedetonating plan. Fig. 400 represents the ordinary percussion lock, which is happilydivested of three awkward projections upon the flint lock, namely, the hammer, hammersprins, a
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. osion, the magazine must be turned so far round as tolet fall a portion of the percussion powder into the pan; after which it is turned back,and the steel punch recovers its proper position for striking another blow into thepan. The invention of the copper percussion cap was another great improvement upon thedetonating plan. Fig. 400 represents the ordinary percussion lock, which is happilydivested of three awkward projections upon the flint lock, namely, the hammer, hammersprins, and the pan. Nothing now appears upon the plate of the lock, but the cockor striking hammer, which inflicts the proper blow upon the percussion cap. It isconcave, with a small metallic ring or border, called a shield or fence, for the purposeof enclosing the cap, as it were, and preventing its splinters doing injury to the sportsman,as also protecting against the line of flame which may issue from the touch-hole in thecap nipple. This is screwed into the patent breech, and is perforated with a smallhole. 400. The safety lock of Dr. Somerville is a truly humane invention. Its essential featureis a slide stop or catch, placed under the trigger a, fig. 401. It is pulled forward intoa notch in the trigger, by means of a spring b, upon the front of the guard, which is?worked by a key c, pressing upon the spring when the piece is discharged. In anothersafety plan there is a small moveable curved piece of iron, a, which rises through an openingB, in the lock-plate c, and prevents the cock from reaching the nipple, as represented inthe figure, until it is drawn back within the plate of the lock when the piece is fired. 401
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
