The Stereoscope Its History Theory And Construction With Its Application to
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VI.
image A'"c, A'c, and AC, corresponding to the position of the eyes at E'"E and E. Hence all the united images of AC, EC, viz. , CA'", CA", &c. , will lie below the plane of ABC, and extend beyond a vertical line N G continued ; and they will grow larger and larger, and approximate in direction to CG as the eyes descend from E'" to M. When the eyes are near to M, and a little above the plane of ABC, the line, when not carefully observed, will have the appearance of coinciding with CG, but st...retching a great way bfeyond G. This extreme case represents the celebrated experiment with the compasses, described by Dr. Smith, and referred to by Professor Wheatstone. He took a pair of compasses, which may be represented by ACB, AB being their points, AC, BC their legs, and c their joint ; and having placed his eyes about E, above their plane, he made the following experiment : " Having opened the points of a pair of compasses somewhat wider than the interval of your eyes, with your arm extended, hold the head or joint in the ball of your hand, with the points outwards, and equidistant from your eyes, and somewhat higher than the joint.
What to read after The Stereoscope Its History Theory And Construction With Its Application to?
You can find similar books in the "Read Also" column, or choose other free books by David Brewster to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
VI.
image A'"c, A'c, and AC, corresponding to the position of the eyes at E'"E and E. Hence all the united images of AC, EC, viz. , CA'", CA", &c. , will lie below the plane of ABC, and extend beyond a vertical line N G continued ; and they will grow larger and larger, and approximate in direction to CG as the eyes descend from E'" to M. When the eyes are near to M, and a little above the plane of ABC, the line, when not carefully observed, will have the appearance of coinciding with CG, but st...retching a great way bfeyond G. This extreme case represents the celebrated experiment with the compasses, described by Dr. Smith, and referred to by Professor Wheatstone. He took a pair of compasses, which may be represented by ACB, AB being their points, AC, BC their legs, and c their joint ; and having placed his eyes about E, above their plane, he made the following experiment : " Having opened the points of a pair of compasses somewhat wider than the interval of your eyes, with your arm extended, hold the head or joint in the ball of your hand, with the points outwards, and equidistant from your eyes, and somewhat higher than the joint.
What to read after The Stereoscope Its History Theory And Construction With Its Application to?
You can find similar books in the "Read Also" column, or choose other free books by David Brewster to read onlineMoreLess
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