as determined ly Chronometen at Sea. 



255 



The following Table will show the rates of the watches iti 

 twenty-four hours, deduced by comparing them with an excel- 

 lent clock with Graham's dead beat escapement, and regulated 

 by transit. 



The first column in this table shows the pole of the magnet 

 applied to the watch; the second and third, the rate or effect 

 produced on each watch ; the fourth column shows the figure on 

 the face of tlie watch opposite to which the magnet was applied. 



The watch. No. I, gained with both poles, and in every posi- 

 tion of the magnet but one. No. 2 gained with both poles in 

 every position. Nos. 3 and 4 gained in evei y position but two ; 

 and the quantities lost in the positions were far exceeded by tlie 

 accelerations caused by the opposite poles, excepting one case 

 in that of No. 4. 



The magnets were Ukewise placed in different positions out of 

 the planes of the balances ; the results were very similar to those 

 above, but differing in quantity, according to the distance of the 

 magnets from the planes of the balances. 



Upon placing the magnets very near to the rim of the balances, 

 a verv rapid acceleration took place with both poles, and in every 

 position of the magnets, particularly in the watches Nos. 1 and 2. 

 Upon too near an approach of the magnets, the watch No. I, 

 and chronometer No. 3, were rendered useless ; the former, when 

 the magnets were taken away, gaining no less than about 1| 

 hour, and the chronometer losing about 50" in 24 hours ; and in 

 again repeating the experiments in the plane of the balances, 

 the rates of the chronometers (without the magnets) were so va- 

 riable, that it was necessary to determine their rates before and 

 after each application of the magnets: the followijig, however, is 

 « Table of the results upon the chronometers Nos. 3 and 4. 



No. 3. 



