A System of Mineralogy: Comprising the Most Recent Discoveries, Including Full Descriptions of Species and Their Localities, Chemical Analyses and Formulas, Tables for the Determination of Minerals, with a Treatise on Mathematical Crystallography and the Drawing of Figures of Crystals, Bände 1-2

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G.P. Putnam, 1854 - 531 Seiten
 

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Seite 469 - ... bitumen is solid and cold near the shores, but gradually increases in temperature and softness towards the centre, where it is boiling. The solidified bitumen appears as if it had cooled as the surface boiled in large bubbles. The ascent to the lake from the sea, a distance of...
Seite 176 - Kyanite" says Professor Pliicker, " is by far the most interesting crystal I have examined. If suspended horizontally it points very well to the north, by the magnetic power of the earth. It is a true compass needle, and more than that, you may obtain its declination ! If, for instance, you suspend it so that the line (A) be on the vertical plane passing through the axis (B) of the prism, the crystal will point exactly as a compass needle does. But by turning the crystal...
Seite 145 - The heat in the immediate adjacency is intolerable, and you are drenched by the vapour, which impregnates the atmosphere with a strong and somewhat sulphurous smell. The whole scene is one of terrible violence and confusion — the...
Seite 143 - Let a mass of matter be supposed to consist of spherical particles all of the same size, but of two different kinds in equal numbers, represented by black and white balls; and let it be required that in their perfect intermixture every black ball shall be equally distant from all surrounding white balls, and that all adjacent balls of the same denomination shall also be equidistant from each other. I say then, that these conditions will be fulfilled, if the arrangement be cubical, and that the particles...
Seite 168 - The sine of the angle of incidence bears a constant ratio to the sine of the angle of refraction.

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