. Memoirs of the American Academy of Arts and Sciences. dition to the wear and waste produced, is also very pre-judicial when the gun is fired with the breech in some confined space, such as the casemate ofa fort, or the betwocn-decks of a ship of war, where the fire is dangerous, and the smoke becomesa serious inconvenience to the gunners. * On tlie CoiistriUtion of Improvcil Onlnancc as proposnl in a Letter to the Socretarics of War ami ofthe Navy, ami the Chiefs of the Bureaus of Engineers and of Onluance of the United States, by Daniel Tread-well. Cambridge, 18(G. Mr. Treadwells conclusion
. Memoirs of the American Academy of Arts and Sciences. dition to the wear and waste produced, is also very pre-judicial when the gun is fired with the breech in some confined space, such as the casemate ofa fort, or the betwocn-decks of a ship of war, where the fire is dangerous, and the smoke becomesa serious inconvenience to the gunners. * On tlie CoiistriUtion of Improvcil Onlnancc as proposnl in a Letter to the Socretarics of War ami ofthe Navy, ami the Chiefs of the Bureaus of Engineers and of Onluance of the United States, by Daniel Tread-well. Cambridge, 18(G. Mr. Treadwells conclusions are fully confirmed by Captain C. S. Smiths exjieriments at Sandy Hoids, in1881, by dro))ping from a height Captain Kodnians instriniient. fjun-making in the United States, by Cap-tain Rogers Rirnie, Jr., Ordnance Department, U. S. Army. Monograi)h VIII., Military Service Institution,New York, 1888, p. 54. Sec also Report of the Chief of Oi-dnance for 1882 (twenty years after Mr. Tread-wells pulilicatiou), p. 124. 482 MEMOIR OF DA>riEL As Elevation is Section of the Device fob Fieisg Cannos. A A represents a portion of the breech of a gun. b is a steel phig screwed intothe gun, through which the vent a is bored, and extending into the cahbre. The upperor outer part of the vent is enlarged to form a recess or chamber, b, into which thepriming cap is placed, c is a strong lever called a sett stock, which is jointed atone end to the stud B, screwed into the gun, which permits the other end to be turnedback from the vent out of the way; in the end over the vent is a steel set or punch, c,the lower end of which fits close in the socket b ; the other end passes up through thesett stock, and has upon it a screwed collar, e. The sett is made with a shoulder thatbears against the under side of the sett stock, and fits it loosely. This sett serves thedouble purpose of a vent stopper and a striker for igniting the primer. This end ofthe sett stock is held down by the butt
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Keywords: ., bookidmemoirsofamerica1888amer, booksubjectscience, bookyear1783
