| 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,... | |
| 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... | |
| 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... | |
| 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... | |
| 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... | |
| 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... | |
| 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,... | |
| 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... | |
| 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... | |
| 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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