Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 37
telescope. One of the mostconvenient of these micrometers is that known as the wiremicrometer, and shown in Fig. 23. The frame A A covers two slides, C and D. These slidesare moved by the screws F and G. The wires F and Bare stretched across the ends of the slides so as to beparallel to each other.… … ASTRONOMY. 21 right, are stretched across the frame at right angles to thewires E, B. We may call the wires x and y the longitudi-nal wires of the micrometer, and E and B the transversewires. Many instruments have only one longitudinal wire,which is stretched across the middle of the focus.…
Astronomy
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