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 198
ru-ment. In earlier times the two observations of rightascension and declination were entrusted to perfectlyseparate instruments. The transit instrument wasmounted as the transit circle is, between two solidstone piers, and moved in precisely the same way. TRANSIT AND CIRCLE DEPARTMENTS 195 But the… … THE MURAL CIRCLE. was attached to it which turned about its centre.This arrangement had a double disadvantage—thatthe two observations had to be made separately, and i96 THE ROYAL OBSERVATORY the mural circle, not being a symmetrical instrument,was liable to small errors which it was difficult…
Royal Greenwich Observatory · Astronomy
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