 | Olinthus Gilbert Gregory - 1802 - 590 pages
...in the angle DBC, and of such a diameter as to admit of but one particle of light : then it was easy to conceive, that the particle of light at C, by which the object must be seen when the eye arrives at A, would pass through the tube BC, so inclined to the line BD,... | |
 | James Smith - Industrial arts - 1815 - 684 pages
...line BD in the angle DBC, of such diameter as to admit but one particle of light. Then it was easy to conceive, that the particle of light at C, by which the object roust be seen, when the eye, as it moves along arrives at A, would pass through the tube BC, if it... | |
 | Arthur Berry - Astronomy - 1899 - 550 pages
...BD in the angle DB c) of such a diameter as to admit of but one particle of light ; then it was easy to conceive that the particle of light at c (by which the object must be seen when the eye, as it moves along, arrives at A) would pass through the tube B c, if it... | |
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DBC, and accompanies the eye in its motion from B to A; and that it could not come to the eye, placed behind such a tube, if it had any other inclination to the line BD. 