. Memoirs of the American Academy of Arts and Sciences. h that, when wound into a coil, it shall form the thicknessrequired for the hoop, after allowing for the waste in welding, forging, and finishing. After itsends have been scarfed to a long wedge form, it is to be heated to a low red heat, and thenwound upon a cylinder of say 25 or 26 inches diameter, as a ribbon is wound upon a , it is to be heated in a proper furnace to a good welding heat, and then, being placed uponan arbor, or mandrel, of about 25 or 26 inches diameter, and between proper dies, sets, orswages, it is to be co
. Memoirs of the American Academy of Arts and Sciences. h that, when wound into a coil, it shall form the thicknessrequired for the hoop, after allowing for the waste in welding, forging, and finishing. After itsends have been scarfed to a long wedge form, it is to be heated to a low red heat, and thenwound upon a cylinder of say 25 or 26 inches diameter, as a ribbon is wound upon a , it is to be heated in a proper furnace to a good welding heat, and then, being placed uponan arbor, or mandrel, of about 25 or 26 inches diameter, and between proper dies, sets, orswages, it is to be completely welded, or the several layers or coils arc to be made to form onepiece. This may be done by compressing it with the swages, by a hydrostatic press, or by asteam hammer. After it is properly welded and condensed in this way, and has cooled as low as600°, it is to be placed ujiou a cold arljor, or mandrel (shown, in section, at A, A, Figures 1 and 2),which is supported at both its ends liy the upright studs of the heavy iron fi-ame B, B. It is.
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