Olmsted, Denison, 1791-1859. [from old catalog] · New York, R. B. Collins · leaf 33
uch a distance from it, as not to distinguishany interval between the ring and the wall; then theseveral figures under which the ring is seen, will appearto be inscribed on the wall, and we shall see the ring asa circle when perpendicular to a straight line joiningthe center of the ring and the… … Here various circles are represented as projected on themeridian, which is supposed to be situated directly be-fore the eye, at some distance from it. The horizon HObeing perpendicular to the meridian is seen edgewise, andconsequently is projected into a straight line. The sameis the case with the…
Astronomy
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