Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 49
sing the meridian determination obtained from the shadowobservations. One leveling screw will then be nearly in the meridianof the center of the instrument, while the two others will liein an east and west line. Bring the level bubble to the middleof its tube by turning the north leveling screw;… … Fig. 32 finger and thumb of each hand, holding them firmly, and turningthem in opposite directions by moving the elbows to or from thebody by the same amount. Turn the telescope north, and the bubble THE DIURKAI. MOTION OF THE STARS 37 should remain in place; if it does not, adjust the north screw.…
Astronomy
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