. Memoirs of the American Academy of Arts and Sciences. Fig. 4. Fio. 3. previously subjected. It will be well, when the stretching is commenced, to have the hoopwarmed up to 200° or 300°. After the hoop has been prepared in this way by cold hammering and stretching, it is to bebored and turned; and, whether it is to be fixed to the gun by a screw-thread, or by any equiva-lent, it is to be carefully and equably heated to such a temperature (but never up to an annealingheat) as shall expand it sufliciently, and, in this state, is to be placed upon the gun.* In the Specification and Memoir before
. Memoirs of the American Academy of Arts and Sciences. Fig. 4. Fio. 3. previously subjected. It will be well, when the stretching is commenced, to have the hoopwarmed up to 200° or 300°. After the hoop has been prepared in this way by cold hammering and stretching, it is to bebored and turned; and, whether it is to be fixed to the gun by a screw-thread, or by any equiva-lent, it is to be carefully and equably heated to such a temperature (but never up to an annealingheat) as shall expand it sufliciently, and, in this state, is to be placed upon the gun.* In the Specification and Memoir before mentioned, I propose to form the screw of abouteight threads, each thread taking about one eighth of an inch space, so tliat one turn advances * The method of makiiiij the rings and applying them is that followed in making the trnnnion-ljands in 1841-44,and for the same reasons, —for secnring them and strengthening the guns. It is thus described by Mr. Treadwell:All these guns that wore finished had trunnion-bands screwed upon them by which the t
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Keywords: ., bookidmemoirsofamerica1888amer, booksubjectscience, bookyear1783
