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Between 1865 and 1873 observations were taken at 31 stations in India by Captains Basevi and Heaviside with the Royal Society’s seconds pendulums. The results were published in Vol. V. of the ‘Account of the Operations of the Great Trigonometrical Survey of India,’ and have been subsequently discussed by many authorities. Captain Basevi expressed his results in terms of N, the number of vibrations of the mean pendulum observed in a mean solar day. The International Geodetic Association show their results in dynes, and it is desirable that we should follow their example. We have, therefore, to change the notation employed by our predecessors.

VIII. On the intensity and direction of the force of gravity in India