ASTRONOMICAL AND GEODETIC OBSERVATIONS. 



63 



vibrations in excess of a certain chronometer interval expressed in seconds. When 

 reduced to the corresponding value for one hour, we have — 

 For face 1 . . . 6.61 



" 3 . . . 7.14 



" 4 . . . 6.52 



" 2 . . . 6.72 



and on the average 6.75 vibrations in excess of the number of seconds 



in an hour. It appears that the rate of the chronometer in sets 1, 3, 7, and 15 

 differed most from this mean, the 1st and 15th falling short of it, and the other 

 two exceeding it; the number of vibrations for these sets were deduced under 

 the supposition that the motion of the pendulum was more regular than that of the 

 pocket chronometer. The following three columns contain the corrections for arc, 

 temperature, and atmospheric pressure, as explained above. The last column 

 shows the number of vibrations of the pendulum in a mean solar day. 



Chronometer 

 intervals. 



Corr'n 

 for rate. 



Mean time 

 intervals. 



No. of 

 vib'ns. 



Corresp. No. 

 in a day. 



Corrections for 

 are. I temp. latm. pr. 



Set 1. Face 1. September 26, 1860. 



S'' 



51" 



59^33 



— 1M6 



3 



51 



49.10 



—1.16 



4 



00 



10.27 



—1.20 



3 



59 



44.09 



—1.20 



3 



59 



42.34 



—1.20 



3 



59 



42.17 



—1.20 



13918M7 

 13907.94 

 14409.07 

 14382.89 

 14381.14 

 14380.97 



13944 



86560.36 



+ 1.06 



—11.62 



—.01 



13934 



61.88 



.96 







14436 



61.48 



.90 







14410 



62.84 



.84 







14408 



61.36 



.75 







14408 



62.38 



.70 







86549.79 

 51.21 



50.75 

 52.05 

 50.48 

 51.45 



Mean 



86550.95 



Set 2. Face 1. September 26. 



19 



48.80 



+ 



.47 



19 



48.40 



+ 



.47 



19 



30.42 



+ 



.47 



19 



18.60 



+ 



.47 



18 



24.83 



+ 



.46 



18 



16.66 



+ 



.47 



11989.27 

 11988.87 

 11970.89 

 11959.07 

 11905.29 

 11897.13 



12012 



86563.80 



+ .76 



—11.84 



—.02 



12012 



66.68 



.72 







11994 



66.76 



.67 







11982 



65.66 



.64 







11928 



64.80 



.58 







11920 



66.08 



.55 







86552.70 

 55.54 

 55.57 

 54.44 

 53.52 

 54.77 



Mean 



86554.42 



Set 3. Face 1. September 27. 



4 13 

 4 12 



26.99 



H- 



.09' 



58.98 



+ 



.09 



49.36 



+ 



.08 



45.02 



4- 



.08 



23.18 



+ 



.08 



37.43 



+ 



.08 



07.54 



+ 



.08 



.35.34 



+ 



.08 



15507.08 



■ 15536 



15479.07 



15.^08 



15409.44 



15438 



15405.10 



15434 



15263.26 



15292 



15217.51 



15246 



15187.62 



15216 



15155.42 



15184 



86561.12 



+ 1.16 



—13.79 



—.02 



61.46 



1.08 







60.14 



.96 







62.08 



.90 







62.68 



.74 







61.74 



.70 







61.42 



.67 







62.92 



.63 







Mean 



86548.47 

 48.73 

 47.29 

 49.17 

 49.61 

 48.63 

 48.28 

 49.74 



86548.74 



