The Royal observatory, Greenwich. A glance at its history and work (1900)
Maunder, E. Walter (Edward Walter), 1851-1928 · London, The Religious tract society · leaf 192
l wire, and the observer pressesa second little button, which records the position ofthe horizontal wire on a small paper-covered drum.Then, the transit over, the observer leaves the tele-scope and comes round to the outside of the westpier. Here he finds seven large microscopes, whichpierce the… … THE TRANSIT CIRCLE. TRANSIT AND CIRCLE DEPARTMENTS 191 circle upon both faces. Each circle is dividedextremely carefully into 4320 divisions — thesedivisions, therefore, being about the one-twentieth ofan inch apart. There are, therefore, twelve divisionsto every degree (12 x 360 = 4320), and each…
Royal Greenwich Observatory · Astronomy
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
