AT THB MADEAS- OBSBToTATORY. %m 



.■•■-"' ^ mate of tlje CMu, . 



22. The transit of the sun was generally observed by the Braynin 

 assistant S'enivassa-Chairy, either during, or about the time of the 

 experiments; and the mean time was deduced therefrom, as is usual in 

 all observatories. The following table will shew the rate of the clock, 

 which was used, for twenty days. 



23. By this statement, 

 the mean rate of the clock 

 appears to be a'.gi per di- 

 em, gaining. So that, in 

 One second of tim^ , its gain 

 was o".oooo3367. This 

 qjuantity has. been used, in 

 r.^4u(?ing |:he ^li^m^e psr alock to the true mean, time elapsed ; and, by apply^ 

 itig thiS((^rFeptipr?>ufia,<^ .<^ividin true time elapsed by the number of 

 oscillations of the clock pendulum, we have, on a mean of 10 sets, 

 o' .9999663 of time, fo» one oscillation of the same, 



Cowptitatwn., 



24.. In order to resolve the present problem, we have three different 

 ^gntities{Jt6" compute : ist,. the diameter of the ball: ad, to deduce from 

 H&ewce-tfae* length- of the simple pendulum, which will be isochronal to it. 

 sd To deduce from the above, the length of a simple; peitdulum which 

 wilLs^rike seconds ill latitude 13° 4 12". 



»5. Foa^h.Q3^ various operations we require the following data. 



Grains. 



• y. Tl*e IweiglVt of the ball, W=:;74J.282 



-'• &- The weigUt of tlie string, Zi^-=2.0061 



3. Thespeciiic gravity of cast lead, '. 8=^11.325 



Dwijs of 



Clock 



Rate j 



Da,,. 



of 



Clock 



Rate 



Month. 



fast. 



gaining. \ 



Mon 



th. 



fas:t. 



gaining. 



Nov. 14 



7-21.6 



2.9 





25 



7-56.3 



2.8 



15 



7-24.2 



2.55 





26 



7-59.7 



3.4 



16 



7-27.4 



3.26 





27 



8-2.7 



3.0 



17 



,7^31.0 



3.54 





28 



8-5.7 



3.0 



18 



7-34.0 



3.0 





29 



8-8.6 



2.9 



19 



7-37.4 



S.4 





30 



,8-J0,l ■■ 



1.5 



20 



7-40.8 



2.4 



Dec. 



1 



8-12.3 



2.3 



21 



7-43.4 



2.6 





2 



8-14.9 



: ^S.,^ 



22 



7-46.9 



- 3.3 





3 



8-17.6' 



\ 2.1 •■ ■ 



23 



7-50.9 



4.0 





4 



8-20.6 



3.6 



24 



7-53.5 



2.6 





5 



8-22.8 



2.2 



