of a Chronometer. 



125 



of the horizon ; the experiment agreeing in this particular with 

 one determined for the first Chronometer. The following Table 

 contains the results : 



and from which it appears, that the mean of the four intensities 

 approach very nearly to the assumed terrestrial intensity, and 

 that, moreover, a much greater uniformity exists among the re- 

 sults than in those determined for the first Chronometer. 



The examples that have been furnished by Messrs VARLEY, 

 FISHER, BARLOW and Captain SCORESBY, relative to the magne- 

 tism of Chronometers, and from many experiments I have had 

 an opportunity of performing, and a detailed account of which 

 I hope soon to draw up, induce me to believe, that nothing short 

 of the absolute removal of every thing capable of retaining the 

 magnetic influence in the balance, will prove an effectual remedy 

 for the errors to which the rates of Chronometers are liable from 

 this cause. Captain SCORESBY, in an excellent paper published 

 in the 9th volume of the Edinburgh Transactions, proposes, with 

 his usual ingenuity, to free the balance from any magnetism it 

 may have acquired, by causing it to be ground and polished in 

 the plane of the magnetic equator ; or, as they are now gene- 

 rally constructed of soft steel, to have them turned in that plane. 

 This method of obviating their anomalous action, would in all 

 probability be effectual, if similar precautions could be taken 

 with the steel employed in the other parts of a Chronometer. 

 But the chain alone would be capable of imparting, in a short 



