. Relazione annuale dell'istituto americano, della città di New York. La scienza. 408 operazioni dell'istituto americano. spostato a conformarsi alla direzione del tiro; e molti hanno notato, quando sparare cannoni sulla nave-carrelli ad alta quota, che la culatta della pistola è stato sollevato, e venne nuovamente verso il basso con un forte colpo sul concio o vite di elevazione. Se l'inseguimento della pistola è leggero, il muso sarà •talvolta essere interrotta, invece di superare l'' ^^^^^^^^^^-^^^^^'^ inerzia della pistola o sollevare- ^"?"^ ? -" '' Iiig culatta improvvisamente, C. (?";:'.'; w-J)-

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. Annual report of the American Institute, of the City of New York. Science. 408 TRANSACTIONS OF THE AMERICAN INSTITUTE. moved to conform to the direction of the shot; and many have noticed, when firing guns on ship-carriages, at high elevation, that the breech of the gun was raised, and came down again with a considerable blow on the quoin, or elevating screw. If the chase of the gun is light, the muzzle will •sometimes be broken off, instead of overcoming the '' ^^^'^^^^^^^'-^'^^^^'''''^ inertia of the gun, or lift- ^'"?"^ ? -" '' iiig the breech suddenly, C. (?';:'.'; w-J)- V ^— I I against the resistance of the preponderance. This example is inserted as one of the peculiarities of living force, as exhibited in gunnery, viz: resistance to changes of direction by bodies in motion, and to account for the failure of many of the Dahlgren and Parrott guns, from the breaking off of their muzzles, as has frequently happened to the Parrott rifle guns, and to the Dahlgren guns since the war began. From the fact that solid cast guns, of the largest size now in service, have a certain strain upon them within themselves when cast, from the heat leaving the inner metal last, which is relieved by the expansion of the inner metal by the first few discharges, I hold that solid-cast Dahl- gren guns, or any columbiads of large sizes, cast solid, may pass the inspection of ten service charges, and be stronger at the tenth discharge than they were at the first—that number of rounds, perhaps, being neces- sary to relieve them of the beforeraentioned strain, by communicating the proper proportion of heat to place them in the same state in which we find the hollow cast gun at the first round. The guns in our service having great thickness of metal about the bore, should not be relied upon in rapid firing, even when exposed to the hottest rays* of the sun on their very large exterior surface—the most favorable circumstances under which a gun can be fired—and sh

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• bookcentury1800
• bookdecad
• bookpublisherslsn
• booksubjectscience