450 



MEMOIR OF DANIEL TREADWELL. 



may 



made of very soft and tough iron and has not been hammered very hard, much more than this 

 quantity. The extent, however, to which this hammering and cold stretching may be carried, 

 must depend upon the quality of the iron and the heating and working to which it has been 



Fig. 4. 



Fig. 3. 



previously subjected. It will be well,, when the stretching is commenced 



warmed up to 200° or 300°. 



hammering and stretching, it is to be 



^..w wv ^^ uub ucuu [.uupareu in mis way oy coia nammenng ana stretcmng, n is iu w 

 bored and turned ; and, whether it is to be fixed to the gun by a screw-thread, or by any equiva- 



heat) 



(but 



, t — ^ .„ ~.i...wwxi,ijf, auu, in tins state, is to oe piaceu upon me gun. 



" In the Specification and Memoir before mentioned, I propose to form the screw « of about 

 eight threads, each thread taking about one eighth of an inch space, so that one turn advances 



• The method of making the rings and applying them is that followed in making the trnnnion-bands in 1841-44, 

 and for the same reasons, - for securing them and strengthening the guns. It is thus descrihed by Mr. Treadwell : 

 ' All these guns that were finished had trunnion-bands screwed upon them by which the trunnions were secured to 

 the gun. In order to utilize the strength of the trunnion-band against the force of the discharge of the powder, and 

 to bring it in as an addition to the thickness of the body of the gun, the inside of the trunnion-band was in all 

 cases made smaller than the body of the gun at the place upon which it was screwed. None of them could be got 

 into their places when cold. They were therefore all heated to a small degree, and run on to the gun to their places 

 white under the expanding influence of this heat. ... The band, in each case, was taken across the road to the 

 blacksmith's shop, and there warmed up, never to a red heat in any case. - "~" on °° 



500°, never 900 



■vr . »' "ft ■"»»»« <■'-' <* icu ucai iu tiny case. 1 suouiu iiimn. aiuays «wi/ , •*»"«/« 



No iron bars or tools were used in handling them, but the men took hold of them with cloth, and aprons, or anything 



of that kind which would defend the hand from the warm iron. I do not recollect ever seeing a cloth burnt in 



the operation." See Daniel Treadwell vs. Kobert P. Parrott, United States Circuit Court, Southern District of New 

 York, 1864. 



