The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . ARMSTRONG GUN. such a manner that, when it is turned about its own axis,the fitted part acts as a lever or pry, and brings the car-tridge to the rear. The extractor is brought back to itsplace, as the breech is closed, by means of a strong helicalspring outside the gun. The gun itself is of wrought iron,the inner tube being of steel, iron-bound. A somewhat similar gun is the Nordenfelt, which ismade in smaller calibres, the one illustrated having a two- RECENT PROGRESS IN GUNS AND ARMO
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . ARMSTRONG GUN. such a manner that, when it is turned about its own axis,the fitted part acts as a lever or pry, and brings the car-tridge to the rear. The extractor is brought back to itsplace, as the breech is closed, by means of a strong helicalspring outside the gun. The gun itself is of wrought iron,the inner tube being of steel, iron-bound. A somewhat similar gun is the Nordenfelt, which ismade in smaller calibres, the one illustrated having a two- RECENT PROGRESS IN GUNS AND ARMOR. 107 and a-quarter-inch bore. It is shown with a halt-shield,as arranged for naval use, being designed to stand behinda breastwork a yard in height. It is five feet seven incheslong, and weighs less than five hundred pounds, yet it firesa six-pound shot with an initial velocity of a quarter of amile a second, with a fraction over half a pound of smoke- Fi(i. NORDENFELT GUN. less powder. The same gun is arranged to be mounted ona field-carriage for land service. Among other modern guns should be mentioned theCanet, adopted in 1891 by Russia, and to some extent byChili. It has a tube the length of the piece, and isstrengthened by a jacket and hoops. A seven-inch gunof this make weighs five and a half tons, and requires fivemen to operate it. A muzzle velocity of two thousandeight hundred and eighty-seven feet has been obtained withan eighty-pound projectile, and six to eight shots can befired in a minute. 108 WONDERS OF MODERN MECHANISM. A very fi)rmidable Aveapon is the Hotchkiss revolvingcannon, which fires a nine-inch cartridge, six feet long, andweighing eleven hundred and sixty pounds. The cartridgeis filled with shrapnel, aud the rate of discharge is ninetyrounds a minute, or the equivalent of two thousand twohundred and fifty projectiles. It is mounted on a truck,being designed to protect ditches aud fortifications. Onlytwo men are r
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Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectmechanicalengi
