The new international encyclopaedia . HANI8M. The upper figure shows a vertical view of the breach ofa Kruppgun. The brt-orh block, which is wedge-nhapt^dand has its axis not perpendicular, but oblique to theaxi-s of the gun. niovis as shown in the lowerdiajrrani, a horizontal section, and when moved to theright by the rotation of the translating screw allows thepnjjectile and charge to be inserted in the gun by bringingan open portion of the block in line with the bore. To closethe breech tlie translating screw, which has a quick pitchand works in a lialf niit on the gun jacke
The new international encyclopaedia . HANI8M. The upper figure shows a vertical view of the breach ofa Kruppgun. The brt-orh block, which is wedge-nhapt^dand has its axis not perpendicular, but oblique to theaxi-s of the gun. niovis as shown in the lowerdiajrrani, a horizontal section, and when moved to theright by the rotation of the translating screw allows thepnjjectile and charge to be inserted in the gun by bringingan open portion of the block in line with the bore. To closethe breech tlie translating screw, which has a quick pitchand works in a lialf niit on the gun jacket, is turned. Thismoves the breech block so that the solid part conif^s* infront of the bore, but does not, however, lock the brtM-cli orforce the gas check into its place. This is accomplishedby the locking screw and accompanying mechanism, whichforces the block forward and secures it firmly. be classified under either the transversely slid-ing block system, of wliich Krupps is the mostimportant, or the longitudinal screw-block sys-. KlG. 7. BREFCH MKCHAMSM {iNTERRUPTKn SCREW) OF tT. S. 10-, AND 12-INCH BKEECH-LOADISG RIFLES. MODEL 1888. Breech open, slujwing tray, double-threaded translatingscrew, block spindie, gaft check, pad. and latch. tern, of which the United States service typesare prominent examples. In 1S58 Armstrongs32-pounder rifled breech-loading guns introduced ORDNANCE. 69 ORDNANCE. into the English Xa\y had a transverse blocksupported by a longitudinal screw block boredout to permit loading when the transverse blockwas removed. About the same time Krupp hada breech-loading system of transversely slidingwedge-shaped block, essentially his present sys-tem. In 1849 Chambers (United States) patented gear, first rotates the block to bring the opposite the open ones of the gun. thendraws the block to the rear clear of the gun,and finally sw-ings it to one side on a tray hingedto the gun. These three motions are always Rotating Crank Pinion-Rota
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Keywords: ., bo, bookcentury1900, bookdecade1900, bookpublishernewyorkdoddmead
