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 161
es. Once in every twoseconds a similar mark was made by a current sentby means of the standard sidereal clock of theObservatory. The paper cover of the chronographafter an hours work shows a spiral trace of little dotsencircling it some thirty times. These dots are atregular intervals, about an… … THE CHRONOGRAPH. observer. If, then, one of the clock dots and one ofthe observers dots come exactly side by side, we THE TIME DEPARTMENT 159 know that the star was on one of the wires at a givenprecise second. If the observers dot comes betweentwo clock dots, it is easy, by measuring its…
Royal Greenwich Observatory · Astronomy
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