The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . ort is in position for loading, and it falls out of the way whenthe breech is being closed. In the larger types of all breech mechanisms ball bearings areemployed various parts, such as the hinge pin bearings, &c, toreduce friction and in most of the modern heavy guns on boardship the breech mechanism is arranged to be worked by a hydrauliccylinder placed on the breech face, or by a small hydraulic engineor electric motor placed in some convenient position on the hand gear, howeve
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . ort is in position for loading, and it falls out of the way whenthe breech is being closed. In the larger types of all breech mechanisms ball bearings areemployed various parts, such as the hinge pin bearings, &c, toreduce friction and in most of the modern heavy guns on boardship the breech mechanism is arranged to be worked by a hydrauliccylinder placed on the breech face, or by a small hydraulic engineor electric motor placed in some convenient position on the hand gear, however, is always retained for emergency and aclutch is provided so that it can be put into action at a momentsnotice. The Welin screw is largely used in the United States, but in heavyguns the ordinary cone (not steep cone ) de Bange obturator isemployed. The screw is mounted either in a carrier ring or on acarrier tray. In France the ordinary type of interrupted screw isadopted and this rests in a carrier tray. The operations of openingand closing are very similar to those already All the recent patterns of mechanism have an extractor fittedto extract the empty cartridge case with guns or the firedtube with guns. In field guns it generally takes the formof a lever working on an axis pin. The longer arm of the lever isformed into a jaw which rests on the inner face of the breech openingbeneath the rim of the cartridge case, and the short arm is soarranged that when the breech is opened the carrier, in swingingmechanisms, or the breech block itself, in sliding systems, suddenlycomes in contact with it; the long arm is thus jerked backwardsand extracts the case. In mechanisms the tube extractor is
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Keywords: ., bookcentury1900, bookdecade1910, bookidencyclopdiab, bookyear1910
