The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . olving hcadstock B isdriven by a belt and suitable gearing. With wire guns the procedure is somewhat different. The wireis wound on to its tube, which has been previously fine turned, theexterior diameter of the wire is then carefully measured and the In order to obtain additional longitudinal strength the outertubes are so arranged that each hooks on to its neighbour frommuzzle to breech. Thus, the chase hoop hooks on to the barrel bya step, and the succeeding hoops hook on to each other until th
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . olving hcadstock B isdriven by a belt and suitable gearing. With wire guns the procedure is somewhat different. The wireis wound on to its tube, which has been previously fine turned, theexterior diameter of the wire is then carefully measured and the In order to obtain additional longitudinal strength the outertubes are so arranged that each hooks on to its neighbour frommuzzle to breech. Thus, the chase hoop hooks on to the barrel bya step, and the succeeding hoops hook on to each other until thejacket is reached which is then secured to the breech piece by astrong screwed ring. In all the latest patterns of English gunsthere is a single chase hoop covering the forward portion of the 196 ORDNANCE (HISTORY AND CONSTRUCTION gun and a jacket covering the breech portion, an arrangementwhich simplifies the design but increases the difficulties of manu-facture. Wire guns are now made of almost all calibres, ranging from 3 12 in. Many authorities objected to guns of less calibre than. Elswick System Woolwich System Fig. 19.—Wire Fastening. 4-7 in. being wound with wire, as they considered that on diametersso small the interior surface of each layer of wire is over-compressed,while the exterior is too much extended; but by proportioning thethickness of the wire to the diameter of the tube on which it iswound there is no reason for this to be so. The wire is wound on the barrel at a certain tension, ascertainedby calculation, and varying from about 50 tons per square inch forthe layers first wound on the gun, to about 35 or 40 for the outerlayers. To fasten the wire at the beginning and end several methodsare adopted. In the Woolwich system a narrow annular ring(fig. 19), with slots cut into one of its faces, is shrunk on to thegun; into these slots one end of the wire is inserted and securedin position by a steel screwed plug. The wire is wound on for thedistance des
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