Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 106
ircle and level bymeans of which its line of collimation may be set so as tomake any angle with the vertical, and the revolving hori-zontal plate has a clamp and tangent screw by means ofwhich the instrument can be brought into the plane of themeridian. This* plate has also two movable stops… … To explain the use of this in-strument, let E be the place of theobserver; Z bis zenith; HZH themeridian of E ; s and s the points ofculmination of two stars, whose rightascensions differ by only a few min-utes of time. We also suppose thatthe distances Zs and Zs to be approx-imately known, and…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Works. Popular edition.] 2 series (1886)](https://img.insideoutlibrary.com/img/200/bl-bl_003191336_9-384-1.webp)
