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" Is the projection of crystals, the eye is supposed to be at an infinite distance, so that the rays of light fall from it on the crystal in parallel lines. The plane on which the crystal is projected is termed the plane of projection. "
A System of Mineralogy: Comprising the Most Recent Discoveries: Including ... - Seite 98
von James Dwight Dana - 1854 - 533 Seiten
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The American Journal of Science and Arts

1837 - 868 Seiten
...mathematical crystallography, which afford expressions for the planes indicating their exact situation.* 3. In the projection of crystals, the eye is supposed...light fall from it on the crystal in parallel lines ; otherwise the more distant parts of parallel edges should converge, as in the ordinary sketches of...
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The Penny Cyclopædia of the Society for the Diffusion of Useful ..., Band 14

1839 - 502 Seiten
...respectively be equal to the cotangents of their latitudes. Orthographic l^rojcclion.—ln this projection the eye is supposed to be at an infinite distance, so that the visual rays leave the sphere in parallel lines. The perspective ilane on which a hemisphere is supposed...
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Account of the Museum of Economic Geology, and Mining Records Office ...

Thomas Sopwith - 1843 - 158 Seiten
...drawings are so commonly used as to be generally well understood. In both these modes of projection the eye is supposed to be at an infinite distance, so that no one part of the surface represented appears less than another, which would be the case if the point...
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A System of Mineralogy: Comprising the Most Recent Discoveries ..., Bände 1-2

James Dwight Dana - 1854 - 954 Seiten
...obtained. ON THE DRAWING OF FIGURES OF CRYSTALS. In the projection of crystals, the eye is supposed to bo at an infinite distance, so that the rays of light fall from it on the crystal in parallel lines; und not diverging as iu ordinary landscape perspective. If parallel lines were drawn from the vertices...
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The English Cyclopaedia

1867 - 528 Seiten
...these cases therefore are seldom brought into use. OrlAoyrap/iic Projection. — In this projection the eye is supposed to be at an infinite distance, so that the visual rays leave the sphere in parallel lines. The perspective plane on which a hemisphere ii supposed...
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A Text-book of Mineralogy: With an Extended Treatise on Crystallography and ...

Edward Salisbury Dana, James Dwight Dana - 1877 - 566 Seiten
...equations, ci by the working out of the spherical triangles on the sphere of projection. APPENDIX B. ON THE DRAWING OF FIGURES OF CRYSTALS. IN the projection...rays of light fall from it on the crystal in parallel linea. The plane on which the crystal is projected is termed the plane of projection. This plane may...
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A Text-book of Mineralogy: With an Extended Treatise on Crystallography and ...

Edward Salisbury Dana, James Dwight Dana - 1877 - 514 Seiten
...equations, 01 by the working out of the spherical triangles on the sphere of projection. APPENDIX B. ON THE DRAWING OF FIGURES OF CRYSTALS. IN the projection...that the rays of light fall from it on the crystal iu parallel lines. The plane on which the crystal is projected is termed the -¡Лте of projection....
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A Text-book of Mineralogy: With an Extended Treatise on Crystallography and ...

Edward Salisbury Dana, James Dwight Dana - 1877 - 508 Seiten
...spherical triangles on the sphere of projection. APPENDIX B. ON THE DRAWING OF FIGURES OF CRYSTALS. Is the projection of crystals, the eye is supposed to...light fall from it on the crystal in parallel lines. The plane on which the crystal is projected is termed the plane of projection. This plane may be at...
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A Text-book of Mineralogy: With an Extended Treatise on Crystallography and ...

Edward Salisbury Dana, James Dwight Dana - 1877 - 518 Seiten
...equations, ot by the working out of the spherical triangles on the sphere of projection. APPENDIX B. ON THE DRA.WING OF FIGURES OF CRYSTALS. IN the projection...supposed to be at an infinite distance, so that the raye of light fall from it on the crystal in parallel lines. The plane on which the crystal ie projected...
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A Text-book of Mineralogy: With an Extended Treatise on Crystallography and ...

Edward Salisbury Dana - 1877 - 578 Seiten
...prism includes the six planes of the form [/</tOJ, and the remaining six of the form [efO\. APPENDIX B. ON THE DRAWING OF FIGURES OF CRYSTALS. IN the projection of crystals, the eye is supposed to be nt an infinite distance, so that the rays of light fall from it on the crystal in parallel lines. The...
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