This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886 Excerpt: ...Nos. 1 to 4, to which we have already referred. After the removal of nearly lcm of shell, hardness is still retained at the ends of No. 1, whereas it gradually vanishes near the middle parts. This, again, is adverse to toe shrinkage hypothesis. Garburation.--The probability of absence of true shrinkage to which we ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886 Excerpt: ...Nos. 1 to 4, to which we have already referred. After the removal of nearly lcm of shell, hardness is still retained at the ends of No. 1, whereas it gradually vanishes near the middle parts. This, again, is adverse to toe shrinkage hypothesis. Garburation.--The probability of absence of true shrinkage to which we referred in the last paragraph, taken in connection with the great molecular stability of the shells in the divers specimens of steel examined, suggests that the intensity of the mechanical strain of glasshard steel may possibly be overestimated. Mere superficial scratching is frequently sufficient to explode a Rupert's drop.1 Glass-hard steel, on the other hand, may be reduced in thickness to quite one-third the original diameter, or again, thin rods (0.7cm) reduced to mere filaments without showing any thoroughly satisfactory evidence of shrinkage. In all the experiments made by the resistance method, hardness is found to increase very perceptibly from surface to core; the (thin) rods (radius = 0.3cm) are hardest at the axis. If, therefore, steel has once been subjected to an operation capable of evoking the strain of dilatation in question, the strain imparted appears to possess a certain permanence of character and to be able to maintain itself independently of the presence or thickness of the surrounding layers. In this respect it is peculiar. It yields readily to temperature only; and we infer that it owes its persistency to molecular or chemical agencies.2 Suppose, therefore, that with the carbon available in steel it is possible under favorable circumstances to produce a variety of iron-carburets; in other words, that under favorable variation of circumstances, a certain latitude of density is a possible occurrence. Then we argue, plausibl...
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Add this copy of Notes on the Geology of Northern California... to cart. $53.69, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2011 by Nabu Press.
