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. 1881 edition. Excerpt: ...lie upon the same great circle, which, from the property of the projection, will either be a straight line when it passes through the pole of the circle of projection, or an arc of a circle when in any other position. Fig. 317 is an example of the spherical projection of a crystal of Topaz, containing the ...
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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. 1881 edition. Excerpt: ...lie upon the same great circle, which, from the property of the projection, will either be a straight line when it passes through the pole of the circle of projection, or an arc of a circle when in any other position. Fig. 317 is an example of the spherical projection of a crystal of Topaz, containing the forms oo P, 00/2, P, P, i?, %P2, Pcc, ocAo, 0, as shown in horizontal projection in fig. 318. In it the principal zones, or those that include the terminal pinakoid, are represented by diameters, which are projection's of meridians of the sphere, whose direction is found by laying off at the centre the supplements to the interfacial angles of the prism from the pole of 010; the position of the pole of any iatermediate face in these zone circles being found by taking in them a distance equal to the tangent of half the supplement ot the inclination of the face upon o P, the radius being considered as unity. Zones that are not perpendicular to the plane of projection, or do not include o P, are represented by arcs of circles, these being the stereographic projections of great circles oblique to the equatorial plane. This system has the advantage of representing the faces of crystals in the most general manner--namely, by points--and therefore there is no limit to the number of them that can be included in a single figure. Some very remarkable examples will be found in Descloizeaux's 'Text-book of Mineralogy.' CHAPTER XL PHYSICAL PROPERTIES OF MINERALS: --CLEAVAGE, HARDNESS, SPECIFIC GRAVITY, ETC. The methods employed in the second great division of mineralogical research, or the investigation of the structural peculiarities of minerals, are essentially those of experimental mechanics and physics. All such investigations are based upon the assumed...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.