5230 



CAPTAIN SABINE ON THE REDUCTION TO A VACUUM 



the extent that the state of the pump would permit, which left the gauge at 

 0.8 inch : when the following observations were made. 



Thermometers. 



Guage. 



Unies of 



Disapp. Re-app, 



Coincidence. 



Arc registered and 

 true Arc. 



Mean 

 IntervaL 



Correc- t> j ^ 

 tion for ?*1"^t. 



Corrected 

 Vibrations 



at36\ 



inch. 



Mr. , 

 Taylor. 



39.8 



40.3 



40.3 



40.4 



0.80 



3 



44 



45 



46 



88 



89 



90 



150 



151 



153 



39.9 



40.4 



40.3 



40.8 



0.84 



40.1 



40.6 



40.5 



40.8 



40.1 



40.6 



40.6 



40.8 



0.88 

 0.97 



53 24 

 I 49 

 10 16 

 57 07 

 05 35 

 14 03 

 10 24 

 18 55 

 27 26 

 57 46 

 6 17 

 14 50 



53 36 

 2 01 



10 28 



57 27 

 05 54 



14 23 



11 05 

 19 28 

 28 02 



58 30 

 6 64 



15 23 



1) m 8 



1 01 55.67 



■ 7 05 44.83 



■ 13 19 13.33 

 • 22 06 36.67 



Div. o 



1.02 = 1.22 



0.715 = 0.86 

 0.47 =0.56 

 0.20 =0.24 



507.66 



,284 

 510.37 



i 509.: 



+ 1.76 

 +0.82 

 +0.25 



+ 1.94 

 +2.00 

 +2.05 



86316.69 

 Gauge 0.82 



86316.90 

 Gauge 0.86 



86317.12 



Gauge 0.925 



39.97; +0.75=40.72 



0.872 



86316.90 



A free communication was then established with the external air, and the 

 following observations made. 



Observer. 



(MT3 Thermometers, 



Standard 

 Barom. 



Disapp. Re-app. 



Arc registered 

 and true Arc. 



Mean 

 Interval. 



Correc- 

 tion for 

 Arc. 



Reduct. 

 to 363. 



Corrected 



Vibrationg 



at 36°. 



Mr. , 

 Taylou < 



1 



2 



3 



24 



25 



26 



inch. 



41.2 



41.3 



41.0 

 4L6 



30.14 



'so.ii" 



52 03 

 00 18 

 08 34 

 1 20 

 9 34 

 17 53 



52 16 

 00 30 

 08 46 

 1 55 

 10 10 

 18 23 



h m s 

 24.5 



3 9 52.5 



Div. o 



0.81 =0.97 



0.225 = 0.27 



^494.26 



+ 0.56 



+ 2.11 



86306.39 



41.25 



30.125; Capill. + 0.019; Reduction to 32° - 0.031; = 30.113. 



86306.39 



The vibrations in this experiment were as follows : 



In an atmosphere of hydrogen gas 86314.95 ; Barom. 30.120 inches. 



In rarefied hydrogen gas 86316.90 ; Gauge 0.872 



In atmospheric air ! 86306.39 ; Barom. 30.113 inches. 



Whence it appears, 1st, that at nearly equal heights of the barometer (30.120 

 inches for the hydrogen gas, and 30.113 inches for the atmospheric air) the 

 pendulum made 8.56 vibrations per diem more in hydrogen gas than in atmo- 

 spheric air; the temperature of the gas being 39°.75, and of the air 41°.25. 

 And 2nd, that the pendulum made 1.95 vibration per diem more in hydrogen 

 gas, when the height of the gauge was reduced to 0.872 inch, than when the 



