A Manual of Elementary Projection Drawing, Involving Three Dimensions ...
A Manual of Elementary Projection Drawing, Involving Three Dimensions ...
S Edward Samuel Edward Warren
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97, in which many of the asperities may be supposed to have one little facet each, so situated as to remit to the eye a ray received by the body directly from the principal source of light. 188. Having thus proved that a cylinder placed before our eyes can be seen, we may proceed with an explanation of the distribu- tion of tints, h IS midway between d and t. At b^ the ink may be diluted, and at e — e\ much more diluted, as the gradation from a faint tint at e to absolute whiteness at d should ...be without any abrupt transition anywhere. The beam of incident rays which falls on the segment dn^ is broader than that which strikes the equal segment de; hence the segment nd is, on the elevation, marked 5, as being the lightest band which is tinted at all. The segment wr, being a little more obliquely illuminated, is less bright, and in elevation is marked 3, and may be made darkest at the left hand Hmit. Finally, the segment rv receives about as much light as rn^ but reflects it within the very narrow limits, 5, hence appears brighter.
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