A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 192
ces both observersshould use the same stars. This, however, limits the east and westdistance between the stations, as, in order to bring both exchangesbetween the epochs of the time sets, the two stations can not bemuch more than an hour apart, unless an intei*val is introduced be-tween the time… … the star crosses each line of the diaphragm of the telescope. Thisbreak is recorded on the paper which is wrapped around the re-volving cylinder of the chronograph. The observers key and thechronometer are placed on the same circuit and connected with anelectro-magnet whose armature carries the pen…
Surveying
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
