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1. In a former communication I endeavoured to point out a method for calculating the deflection of the plumb-line at stations on the Indian arc, caused by the attraction of the Himalayas and the vast regions beyond, with a view to the correction of the astronomical amplitudes of the measured subdivisions of the arc, before they are applied to the determination of the ellipticity of the earth. The same subject is taken up in the present paper, but in reference to one of the English arcs, that between Dunnose and Burleigh Moor; and a different method of calculating the attraction is given.

philosophical transactions of the royal society of london

IV. On the effect of local attraction upon the plumb-line at stations on the English Arc of the Meridian, between Dunnose and Burleigh Moor; and a method computing its amount