Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 77
isthe mountain, andOi and O2 are twostations on oppositesides of the moun-tain at which plmnblines are suspended.If it were not forthe attraction of themountain they would hang in the directions OiC and O2C.The angle between these fines at C depends upon the distancebetween the stations Oi and Oi.… … Fig. 15. - The mountain method of determiningthe mass of the earth. CH. II, 22] THE EARTH 49 But the attraction of the mountain for the plumb bobscauses tHe plumb lines to hang in the directions OiA andOiA. The directions of these lines with respect to the starscan easily be determined by…
Astronomy
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