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. 1918 Excerpt: ...color is seen in all of them, except those at the sharpest part of the salience, a of Fig. 1. Thus here as in the grooves the cracks may be divided into the main ones, forming a major network, rectangular in this case, and the minor ones forming a nearly rectangular network of a lower order of magnitude; and they may ...
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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. 1918 Excerpt: ...color is seen in all of them, except those at the sharpest part of the salience, a of Fig. 1. Thus here as in the grooves the cracks may be divided into the main ones, forming a major network, rectangular in this case, and the minor ones forming a nearly rectangular network of a lower order of magnitude; and they may be cross classified into those showing copper initially, all of which are filled flush, and the initially black ones, which contain copper but are not filled flush with it to their mouths. 31. Appearance of the Cracks in Section.--In order to make their appearance clear, I had both transverse and longitudinal sections of my forward ring copperplated so as to support the thin hardened layer in grinding and polishing. In both longitudinal and transverse sections the hardened layer is seen as a thin light band, about 3 mm. (J in.) thick, bordered with a thick black band above and a thin one below, the former representing the surface at the junction of the harder steel and the softer copper, which becomes inclined in grinding and polishing the microsection, and hence reflects no light into the microscope; the latter representing not only a like inclined surface at the junction of the hardened layer and the softer unhardened metal, but also probably a band of troostite, formed as described near the end of Sec. 17. In both sections the cracks are spindling slices, carrot-shaped in section. That they hold in depth as slices and not as carrots, I proved by taking three photographs of the same part of a longitudinal section. Fig. 8 shows the initial condition, Fig. 9 and 10 the condition after grinding away 0.5 mm. and 1 mm. Note that the main cracks, A, B, and E, coincide in position and tolerably well in depth in the three photographs. The trans...
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Add this copy of The Erosion of Guns...... to cart. $44.36, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2012 by Nabu Press.
