50 SABINE’S EXPERIMENTS. 
December 30th, P. M. Observer; Professor Renwick ; Bar. 30, 56; Clock making 86367,368 vib. ina m. solar day. 
Times of coincidence. 
Temp. | No. of Co- - : “Arcof | Mean | Interval | Observed vib. | Correctiun Vibration 
incidence. Disap. | Reapp. | Mean. vib. Are. | in sec’ds. | in 24 hours. for Are in 24 hours, 
3553) | dst) [12°.25°.16) 25. 22; (25. 49: AD 23] | “9 
36,6 | 11th | 2.24.26! 24.46 |24.36 |0,61 | : 
| 1, 87186127 5 37 
35, 95| Mean of ten intervals. | | |715,7 |86126 
December 31st, P. M. Observer, Professor Renwick ; Bar. 30, 79; Clock making 86367,368, pie inam. solar day. 
33 Ist |12.47.02| 47.09 |47.05,5|1 , 2 } 
34,2 | 11th | 2.46.35] 46.97 |46.. 46 [05 59 | | 
33,6 | Mean of ten intervals. ‘a | 1718,05|86126 , 78) 1,275 !86128 , 055 
1823, January 1st, noon, Observer Capt. Sabine ; Bar. 30, 51 ; Clock making 86367,368 vib. in a m. solar day. 
31,2 | ist |11.31.44| 31.53 \31.48,51,18 
31,2 | 11th | 1.31.52| 32.10 |32.01 0,6 | 
31,2 | Mean of ten intervals. | | |721, 25|86127 , 86| 1,28 186129 ,14 
January 2d, A.M. Observer, Capt. Sabine ; Bar. 29, 98 ; Clock making 86367,368 vib. ina m. solar day. 
$3,3° |" 1st |. 9-15-33 15. 39° \15..36 -(1,2 | 
35,7 | 11th '11.15.10| 15.26 115.18 10,6 
34,5 | Mean of ten intervals. | | 7182 \86126, 84| 1, 28° |86128, 12 
SS 
January 2d, P. M. Observer Professor Renwick; Bar.30, 02; Clock making 86367,368 vib. in a m, solar day. 
36,2) |) Ts (12 2a OL) OP 07 (21 pee 
37,3 | 11th | 2.20.05; 20. 26 0, 61 
36,75| Mean of ten intervals. | | }715,4 |86125,9 | 1,48. |86127, 38 
SLT UES 4 IRI Ian ile ae PR PRY MAR i al che iy Wd a a ee 
In the next Table, on which the results of the preceding observations are 
collected in one view, and reduced to a mean, is shown, first, the number of 
vibrations of each pendulum at the observed temperature and under the ob- 
served atmospheric pressure: secondly, the number which it is presumed 
would have been made had the temperature been 53 degrees, at which the 
corresponding experiments were made in London ; this number is reduced 
on the supposition (of which more will be said in the sequel) that one degree 
of Fahrenheit’s scale occasions an alteration of #22 of a vibration, in the rate 
per diem; and lastly, the vibrations at 53 degrees are reduced to a vacuum 
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