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Livres Livres 1 - 10 sur 14 pour the face of the crystal, be, observes a reflected image of M, in the direction of....
" the face of the crystal, be, observes a reflected image of M, in the direction of PN. The crystal may now be so changed in its position, that the same image is seen reflected by the next face, and in the same direction, PN. To effect this, the crystal... "
A System of Mineralogy: Including an Extended Treatise on Crystallography ... - Page 32
de James Dwight Dana - 1837 - 571 pages
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A system of mineralogy: comprising the most recent discoveries: including ...

James Dwight Dana - 1850 - 711 pages
...have a much superior instrument in the Reflective Goniometer of Wollaston. The eye at P, looking at the face of the crystal, be, observes a reflected...direction of Pn. The crystal may now be so changed in mv its .position, that the same image is seen reflected by the next face, and in the same direction,...
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A system of mineralogy: comprising the most recent discoveries: including ...

James Dwight Dana - 1854 - 533 pages
...conveniently accomplished by the ingenious and simple contrivance of Wollaston. The eye at P, looking at the face of the crystal, be, observes a reflected...effect this, the crystal must be turned around, until abd has the present direction of be. The angle dbc, measures, therefore, the number of degrees through...
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A System of Mineralogy: Comprising the Most Recent ..., Volumes 1 à 2

James Dwight Dana - 1854 - 533 pages
...have a much superior instrument in the Reflective Goniometer of Wollaston. The eye at J", looking at the face of the crystal, be, observes a reflected...direction, Pn, To effect this, the crystal must be turned amund. until abd has the present direction of be. The angle dbc, measures, therefore, the number of...
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A System of Mineralogy Comprising the Most Recent Discoveries

James D. Dana - 1854
...crystal, whose angle, abc, is required. The eye at J 3 , looking at the face of the crystal, öö, observes a reflected image of m, in the direction...effect this, the crystal must be turned around, until alci has the present direction of be. measures, therefore, the number of degrees through which the...
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A Text-book of Mineralogy: With an Extended Treatise on Crystallography and ...

Edward Salisbury Dana - 1877 - 485 pages
...observes a reflected through an angle which is the supplement of the required angle. This image oi m, in the direction of Pn. The crystal may now be...effect this, the crystal must be turned around, until ubd has the present direction of be. The angle dbc, measures, therefore, the number of degrees through...
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A Text-book of Mineralogy: With an Extended Treatise on Crystallography and ...

Edward Salisbury Dana - 1877 - 485 pages
...obtained by means of a different instrument, called the reflecting goniometer. The eye at P, looking at the face of the crystal, be, observes a reflected...position, that the same image is seen reflected by 261 the next face and in the same direction, Pn. To through an angle which is the supplement of the...
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A Text-book of Mineralogy: With an Extended Treatise on Crystallography and ...

Edward Salisbury Dana - 1877 - 485 pages
...represents a crystal, whose angle, abc, is required. The eye at P, looking at the face of the crystal, 5c, observes a reflected image of m, in the direction...its position, that the same image is seen reflected l>y the next face and in the same direction, Pn. To effect this, the crystal must be turned around,...
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A Text-book of Mineralogy: With an Extended Treatise on Crystallography and ...

Edward Salisbury Dana - 1885 - 521 pages
...aie. is required. The eye at P, looking at the face of the crystal, be, observes a reflected image oi m, in the direction of Pn. The crystal may now be...position, that the same image is seen reflected by 261 the next face and in the same direction, Pn. To through an angle which is the supplement of the...
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Manual of Mineralogy and Petrography: Containing the Elements of the Science ...

James Dwight Dana - 1894 - 517 pages
...understood from the annexed figure, representing a crystal, whose angle abc is required. The eye, looking at the face of the crystal be, observes a reflected image of m, in the direction Pn. On revolving the crystal till ab has the position of be, the same image will be seen again in the...
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A Text-book of Mineralogy: With an Extended Treatise on Crystallography and ...

Edward Salisbury Dana - 1897 - 537 pages
...since 84 CRYSTALLOGRAPHY. through an angle which is the supplement of the required angle. This image oi m, in the direction of Pn. The crystal may now be...effect this, the crystal must be turned around, until abd has the present direction of be. The angle dbc, measures, therefore, the number of degrees through...
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