Report of the United States Board Appointed to Test Iron, Steel and Other Metals, Volume 1

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Page 395 - Mallet as 0. The relative ductility given in the table of the alloys experimented on by the US Board is the proportionate extension of the exterior fibres of the pieces tested by torsion as determined by the autograph strain diagrams.
Page 263 - ... processes, as compared with the cheap steel processes, necessarily give an uncertain character to the former material, while to the latter the desired quality may be imparted with certainty and uniformity. VI. The ordinary practice of welding is capable of radical improvement: the fact has been fully demonstrated; the means should be made the subject of complete experiments. The perfection of means for welding in a non-oxidizing atmosphere would seem to be the promising direction of improvement.
Page 259 - ... direction of further inquiry and experiment, and of impressing the necessity of caution in arriving at conclusions about these irons from the limited data afforded by these experiments. In reviewing the experiments with reference to welding, and under the precaution mentioned, let us observe : — 1st, All the irons were so very low in sulphur, that this ingredient could not have materially affected welding power. 2d, As we shall see in detail, farther on, the irregular differences in the working...
Page 395 - ... Board is the proportionate extension of the exterior fibres of the pieces tested by torsion, as determined by the autograph strain diagrams. It will be seen that the order of ductility differs widely from that given by Mallet. The figures of relative hardness, on the authority of Calvert and Johnson, are those obtained by them by means of an indenting tool. The figures are on a scale in which castiron is rated at 1000. The word "broke...
Page 521 - Franz remarked that whatever the quality may be upon which calorific conduction depends, the close agreement of the figures renders it exceedingly probable that the same quality influences in a similar manner the transmission of electricity; for the divergence of the numbers expressing the conductivity for heat from those expressing the conductivity for electricity are not greater than the divergences of the latter alone, exhibited by the results of different observers. The most extensive series...
Page 395 - Wade agree with those found in the experiments as closely as could be expected from the very variable strengths of alloys of the same composition which have been found by all experimenters. Mallet's figure for copper...
Page 513 - Ure* gives the rule as follows: Multiply the sum of the weights into the products of the two specific gravity numbers for a numerator, and multiply each specific gravity number into the weight of the other body and add the products for a denominator. The quotient obtained by dividing the said numerator by the denominator is the truly computed mean specific gravity of the alloy. Expressed in algebraic language the...
Page 395 - The figures of specific gravity show a fair agreement among the several authorities in the alloys containing more than 35 per cent. of tin, except those given by Mallet, which are in general very much lower than those by all the other authorities. In the alloys containing less than 35 per cent. of tin there is a wide variation among all the different authorities, Mallet's figures, however, being generally lower than the others. Several of the figures of specific...
Page 351 - The results of these tests do not seem to corroborate the theory given by some writers, that peculiar properties are possessed by the alloys which are compounded of simple multiples of their atomic weights or chemical equivalents, and that these properties are lost as the compositions vary more or less from this definite constitution. It does appear that a certain percentage composition gives a maximum strength and another certain percentage a minimum, but neither of these compositions is represented...
Page 1 - Instructions : To observe and to experiment upon the effects of reheating, re-rolling, or otherwise re-working ; of hammering, as compared with rolling, and of annealing the metals.

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