Abstract
1. The present paper is a sequel to two former communications to the Society on the effect of Mountain Attraction on the Plumb-line in India. In the first of these (communicated in 1855) the deflection of the plumb-line caused by the Mountain Mass north of Hindostan is calculated; and in the second (forwarded during the present year) the effect of a small excess or defect of density prevailing through extensive tracts of the earth’s mass is found; with a view to determine whether any compensating cause can possibly exist below, to counteract the large amount of deflection caused by the superficial mass lying above the sea-level. A survey of the causes of disturbance of the plumb-line cannot be complete without taking into consideration the influence of the ocean. To approximate to this is the object of the present paper.

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