﻿474 APPENDIX. 



situations of places in India ; and I insert it on ac- 

 count of its utility and easiness of application. 



Let E=Error of the Watch from mean time at the 

 first place ; 



e=Error from mean time at the second place ; 



T=Time by the Watch at the second place, when 

 the error was e ; 



D=Difference of Longitude between the places j 



N=Interval of mean time between the observa- 

 tions at the two places (found by taking the 

 interval by the Watch, and correcting it ac- 

 cording to the estimated rate, &c.) 



r=Rate of the Watch, or what it gains or loses in 

 a day of mean time. Then, 



