The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . groove Y cut on one side or onboth sides of the block. As the mechanism is opened the hammer His cocked ready for the next round. To close the mechanismthe lever is pushed over to the front, and by releasing the triggersear by pulling the lanyard the hammer falls and fires the cap ofthe cartridge case. Automatic gear is now generally fitted which opens the breechas the gun runs up after recoil and extracts the fired case by meansof a supplementary mechanism and strong spring actuated by therecoil
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . groove Y cut on one side or onboth sides of the block. As the mechanism is opened the hammer His cocked ready for the next round. To close the mechanismthe lever is pushed over to the front, and by releasing the triggersear by pulling the lanyard the hammer falls and fires the cap ofthe cartridge case. Automatic gear is now generally fitted which opens the breechas the gun runs up after recoil and extracts the fired case by meansof a supplementary mechanism and strong spring actuated by therecoil of the gun, and on pushing a new cartridge into the gun thebreech which was retained by the extractor is released and closesI automatically. HISTORY AND CONSTRUCTION] ORDNANCE 201 The Nordcnfclt mechanism consists of a breech block (fig. 35)and a wedge to secure it. A hand lever on the shaft is pulled tothe rear, and this works the action cam, which pulls down thewedge; the breech block is then caused to rotate and (alls back tothe rear. This motion of the breech block actuates the extractor. Fig. 32—Krupp Breech Action. and extracts the case. While the wedge is being withdrawn thefiring pin is pulled back and cocked for the next round. Themechanism is closed by reversing the hand lever; this rotates thebreech block upwards and pushes home the cartridge case, and thewedge is then forced up and secures the breech block. These small type guns, which were introduced to cope withtorpedo boats, are now, however, of little account, since experimenthas proved that nothing smaller than a 12-pounder is sufficient soto injure a modern torpedo boat as to stop it. Most of these smallguns are therefore in the English and in some other Services beingconverted into sub-calibre guns for exercise purposes. Thesesub-calibre guns retain their ordinary breech mechanism, but thebodies are fitted with a strong steel plug screwed on the outsidein a similar manner to the breech screw of the pa
Size: 2712px × 921px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidencyclopdiab, bookyear1910
