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Col. James begins by observing, that as the Royal Society has, from the very commencement of the Ordnance Survey of the United Kingdom, taken a deep interest in its progress, he has great pleasure in announcing to the Society that all the computations connected with the Primary Triangulation, the measurement of the Arcs of Meridians and the determination of the figure and dimensions of the earth are now completed, and that the account of all the operations and calculations which have been undertaken and executed is now in the press, and will shortly be in the hands of the public. In the progress of these operations it has been found, on determining the most probable spheroid from all the astronomical and geodetic amplitudes in Great Britain, that the plumb-line is considerably deflected at several of the principal Trigonometrical Stations, and at almost every station the cause of the deflection is apparent in the configuration of the surrounding country.

proceedings of the royal society of london

III. Account of the observations and computations made for the purpose of ascertaining the amount of the deflection of the plumb-line at Arthur’s seat, and the mean specific gravity of the Earth; with an account of the observed and computed amount of the local attraction at Arthur’s seat and at the Royal Observatory at Edinburgh