Mineralogy and Crystallography: Being a Classification of Crystals According to Their Form and an Arrangement of Minerals After Their Chemical Composition

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Houlston and Wright, 1859 - Crystallography - 298 pages
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Page 480 - Turn the pin, x, on its own axis also, if necessary, until the reflected image of the bar of the window coincides accurately with the observed line below the window. " Turn now the small circular...
Page 480 - ... and until the image of the bar appears to touch some line below the window, as the edge of the skirting-board where it joins the floor.
Page 480 - Now turn the graduated circle, by means of the handle b, until the image of the bar, reflected from the second plane, is also observed to coincide with the same line below. In this state of the instrument the vernier at c will indicate the degrees and minutes at which the two planes are inclined to each other.
Page 284 - LIBRARY From the Bequest of MISS ELIZABETH W. PETERS IN MEMORY OF DR. EDWARD DYER PETERS Professor of Metallurgy in Harvard University 1904-1917 Transferred to CABOT SCIENCE LIBRARY June 2005 * '"C.
Page 482 - To learn to distinguish minerals by their color, weight, and luster, is so far very well ; but the accomplishment is of a low degree of merit, and when most perfect, makes but a poor mineralogist. But when the science is viewed in the light of Chemistry and Crystallography, it becomes a branch of knowledge, perfect in itself, and surprisingly beautiful in its exhibitions of truth. We are no longer dealing with pebbles of pretty shapes and tints, but with objects modeled by a Divine hand ; and every...
Page 590 - The models illustrate the Nature of Stratification ; of Valleys of Denudation ; Succession of Coal Seams in the Newcastle Coal Field ; Strata of Adjacent Lead Mine Districts ; the effects produced by Faults or Dislocations ; Intersections of Mineral Veins, &c.
Page 590 - Valleys of Denudation ; Succession of Coal Seams in the Newcastle Coal Field ; Strata of Adjacent Lead Mine Districts ; the effects produced by Faults or Dislocations ; Intersections of Mineral Veins, &c. ; and are accompanied with a letter-press description, BY T. SOPWITH, Esa., FGS, Memb. Inst. CE, Author of a Treatise on Isometrical Drawing, &c.
Page 479 - This purpose is effected by causing an object, as the line at m (Fig. 379), to be reflected successively from the two planes, a and b, at the same angle. It is well known that the images of objects are reflected from bright planes at the same angle as that at which their rays fall on those planes ; and that when the image of an object reflected from a horizontal plane is observed, it appears so much below the reflecting surface as the object itself is above.
Page 590 - These models are constructed of various kinds of wood fitted together from actual measurements of the strata in the coal and lead mining districts of the North of England. The upper part of each model represents the surface of the ground, — the sides exhibit four vertical sections, each of which corresponds with the sections usually drawn in geological works, and the base of each model represents a horizontal plane at a certain depth under the surface, according to the scale of the model.
Page 590 - All the recent works relating to Mineralogy, Geology, Conchology, and Chemistry ; also Geological Maps, Models, Diagrams, Hammers, Blowpipes, Magnifying Glasses...

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