Letter from Capt Sabine to Professor Renwick, 383 



" I am still, however, in sufficient time to transmit you the 

 accompanying correction of the length of the pendulum de- 

 termined by me at New York, so as to arrive before the meet- 

 ing in September of the Commissioners for revising the laws 

 of the state of New York ; when your report, recommending a 

 reference to that determination, as the means of identifying and 

 defining the standard of linear measure of the state of New 

 York, is to come under consideration. 



** The correction arises from the value of the divisions of the 

 level of the small repeating circle, which I employed in ascer- 

 taining the rate of the clock during the experiments at New 

 York, having been found on examination to be ten seconds^ 

 instead of single seconds as I had supposed them by the engrav- 

 ing on the scale. The observations detailed in the Memoir to 

 which you have referred have in consequence been recalcu- 

 lated ; and the following table exhibits both the former and the 

 corrected results. 



" Whence it appears that the chronometer, and with it the 

 clock and the pendulums, the rates of which were gained by 

 comparison with the chronometer, were going five hundredths 

 of a second in twenty-four hours slower than they were 



