The American journal of science and arts . out one inch from the middleof the inner curve, were .4 of an inch apart, and the widest partof the opening only .45 of an inch. The aUeration in the form of the bar appeared to be hmited tothis portion. On measuring along the interior and exterior edgesof this curved part, the former was found to be , and the lat-ter inches, manifesting a difference in the length of the innerand outer fibres of inches in about 2^ the original length ofthe bent portion. By this kind of trial, the whole form of the cross section ofa bar is changed, and, in
The American journal of science and arts . out one inch from the middleof the inner curve, were .4 of an inch apart, and the widest partof the opening only .45 of an inch. The aUeration in the form of the bar appeared to be hmited tothis portion. On measuring along the interior and exterior edgesof this curved part, the former was found to be , and the lat-ter inches, manifesting a difference in the length of the innerand outer fibres of inches in about 2^ the original length ofthe bent portion. By this kind of trial, the whole form of the cross section ofa bar is changed, and, instead of straight lines, exhibits onlycurves. In the present case, the parallelogram. Fig. 1, was con-verted into the form of the curved Fig. 2, the largest curve be-ing on the inside of the bend. This change of figure and dis-placement of parts, was borne without exhibiting any signs ofrupture, until the degree of curvature above stated had been at-tained, when a few cracks began to appear on the exterior partof the bend. Fig. 1. Fig. The next test to which this iron was subjected, was to heat aportion of the bar to redness, quench it in cold water, and thenbend the same portion cold, in the manner already difference of result was obtained, except a greater facihty inproducing it. A few slight surface cracks were seen near theclose of the operation. A third trial of a similar kind on a bar annealed and cooled indry ashes, resulted like the preceding, but exhibited rather morecracks on the exterior surface of the bend, than either of the fore-going. Another trial of the toughness of this iron when cold, wasmade by drawing out a bar .7 of an inch wide, .18 inch thick,and inches long, and twisting it cold, in the manner of a Experiments on two varieties of Iron. 97 common twisted auger, twice round, in the length just speci-fied. The edges of the spiral were now exactly 7 inches the elongation of the exterior fibres on the edges was , , . —
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Keywords: ., bo, bookcentury1800, bookpublishernewhavensconverse, bookyear1820
