4U 



Mr. Ivory on the Figure of the Earth. 

 Table. 



The ^th column of the table contains the values of J" for 

 the equatorial pendulum observed at Maranham. The mean 

 of the first three numbers is '00530, the value ofjTat the lati- 

 tude of 75°; the mean of the last six numbers is '00531, the 

 value ofyat the latitude of 4-5°; and the mean of all the num- 

 bers in the column is '00532, the value of y at the latitude of 

 about 60°. If we compare the mean number '00532 with the 

 values ofy at all the stations whei'e the pendulum has been 

 so determined as to inspire most confidence in the accuracy 

 of the operations, the discrepancies will be found very small : 

 as at Unst and Leith, at which stations the results of Captain 

 Kater and M. Biot agree, although obtained separately, and 

 by different methods; and at Stockholm, London, Dunkirk, and 

 Paris, at all which places every precaution was used to attain 

 the utmost precision in the experiments. It cannot therefore 

 be said that when L is assumed for the pendulum at the 

 equator, the value of y either increases or decreases from the 

 pole to the parallel of 45°. No other inference can be drawn 

 than that / is constant, the discrepancies in the table being 

 unavoidable in a series of results deduced directly from such 

 experiments. 



And because the value of J is found to be constant when 



the 



