OF A PENDULUM AT GREENWICH AND LONDON. 



89 



Table A. 

 Vibrations of Pendulum 12 in London, March 1828. 



Memorandum of the rate of Mr. Browne's clock by Gumming, from the 10th to the 84th 

 of March : received from Mr. Browne. 



March 10. Gumming fast 4.05 



11. 

 13. 

 14. 

 18. 

 19. 

 24. 



3.95 

 3.57 

 3.64 

 3.63 

 3.63 

 4.01 



losing 0.1 per diem, 

 losing 0.19 per diem, 

 gaining 0.07 per diem, 

 keeping Mean Time, 

 keeping Mean Time. 



s 



gaining 0.07 per diem. 



Exp. 1. March 17th 1828. Clock making 86400 Vibrations in a Mean Solar Day. 



Barom /^^S'n>ng 30.135"! . 

 "*'^°'"*\ ending 30.130/ ^"•^''■^ 





Times of 



Disapp. 



Re-app. 



Coincidence. 



Arc and 

 Correction. 



Mean 

 Interval. 



Reduct. 

 to 62°. 



Corrected Vibra- 

 tions in a Mean 

 Solar Day. 



^2.9 



63.0 

 63.5 



63.5 



1 



2 



3 



25 



26 



27 



m s 

 50 55 

 57 29 

 04 02 

 28 48 

 35 24 

 41 59 



m s 

 50 58 

 57 33 

 04 06 

 28 55 

 35 29 

 42 04 



m s 



50 56.5*1 h m s 



57 31.0 MO 57 30.5 



04 04.0j 



28 51.6-1 



35 26.5 } 1 35 26.5 



42 Ol.Sj 



1.161 * 



> + 0.99 

 O.45J 



394.83 



+ 0.52 



85963.85 



Exp. 2. 



Fresh impulse given. Barom 



■{ 



»S:1S}»-- 



63.5 



63.5 

 63.4 



63.4 



1 



2 

 3 



25 

 26 



27 



Times of 



Disapp. Re-app. 



m s 

 48 48 

 55 21 

 01 54 

 26 29 

 33 04 

 39 38 



m s 

 48 50 

 55 23 

 01 56 

 26 35 

 33 09 

 39 45 



Coincidence. 



m 



48 49.0 



55 22.0 



01 55.0 



26 



33 



39 



} 



1 55 22.00 



4 33 06.67 



Arc and 

 Correction. 



1.28- 



0.49. 



>+1.19 



Mean 

 Interval. 



394.36 



Reduct, 

 to 62°. 



-fO.62 



Corrected Vibra- 

 tions in a Mean 

 Solar Day. 



85963.61 



The reduction to a mean temperature of 62° is throughout computed in the proportion of 0.43 

 parts of a vibration per diem for each degree of Fahrenheit. 



MDCCCXXIX. 



N 



