Journal of the Association of Engineering Societies . als are not to be found as engineering materials. Theyhave all, to a greater or lesser extent, associated with them impuri-ties which were originally present in the ore or which have beenacquired during the process of reduction from the ore. Manuscript received December 15, 1903.—Secretary, Assn of Eng. ASSOCIATION OF ENGINEERING SOCIETIES. The figures shown (Fig. i) are one and all of common char-acter; they all indicate crystalline arrangement. Whether it be themetals lead or tin, or, at the other extreme of physical properties,ant
Journal of the Association of Engineering Societies . als are not to be found as engineering materials. Theyhave all, to a greater or lesser extent, associated with them impuri-ties which were originally present in the ore or which have beenacquired during the process of reduction from the ore. Manuscript received December 15, 1903.—Secretary, Assn of Eng. ASSOCIATION OF ENGINEERING SOCIETIES. The figures shown (Fig. i) are one and all of common char-acter; they all indicate crystalline arrangement. Whether it be themetals lead or tin, or, at the other extreme of physical properties,antimony or bismuth, not shown, it may be seen that each metal isan aggregate of crystalline grains bounded by definite surfaces, andthat no metal, however pure, may be said to be homogeneous, butthat each is an aggregate of homogeneous grains or crystallineunits, homogeneous in themselves, but possessing limited volumeand bounded by surfaces, the forces pertaining to which are verydifferent in character from the forces within the grains
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectenginee, bookyear1881
