OF THE VIBRATIONS OP AN INVARIABLE PENDULUM. 



213 



in 



1 



2 

 3 

 4 

 5 



6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 



Therm, 



70.8 



71.1 



71.5 



71.6 



71.8 



72.0 



72.3 



29 

 30 

 31 

 32 

 33 

 34 

 35 

 36 



37 I 72.5 



38 I 



39 72.6 



Gauge. 



inch. 

 7.00 

 7.56 

 7.10 

 8.00 

 7.00 

 8.10 

 7.00 

 8.00 

 6.70 

 7.90 

 5.60 

 7.00 

 7.00 

 7.00 

 7.00 

 7.00 

 7.10 

 7.10 

 7.10 

 7.00 

 6.90 

 6.90 

 6.90 

 6.90 

 6.90 

 7.10 

 7.50 

 6.90 

 7.00 

 7.00 

 7.00 

 6.90 

 7.00 

 7.00 

 6.90 

 7.00 

 7.00 

 7.00 

 7.00 



7.08 



Times of 



Disapp. Re-app. Coincidence. 



7 54 

 14 10 

 20 27 

 26 44 

 33 00 

 39 16 

 45 33 

 51 50 

 58 06 



4 24 

 10 40 

 16 58 

 23 16 

 29 34 

 35 51 

 42 08 

 48 26 

 54 44 



7 20 



lb" "57 



32 33 

 45 "10 



57 47 



10 24 

 16 42 



29 18 

 35 37 

 41 56 



54 33 



7 11 



8 00 

 14 18 

 20 34 

 26 50 

 33 06 

 39 24 

 45 41 

 51 58 

 58 14 



4 32 

 10 50 

 17 08 

 23 26 

 29 43 

 36 01 

 42 19 

 48 36 

 54 56 



7 31 

 26 "67 



32 44 

 45 "21 



57 59 



10 36 

 16 56 



29 33 

 35 52 

 42 11 



54 49 



7 25 



Inter- 

 vals. 



07 57 

 14 14 



1 20 30.6 



26 47 



33 03 



39 20 



45 37 



51 54 



58 10 



2 04 28 



2 10 45 



2 17 03 



2 23 21 



2 29 38.5 



2 35 50 



2 42 13.5 



2 48 31 



2 54 50 



3 07 25.5 



sio 02" 



3 32 38.5 

 3 "45 i'5.'5 



3 57 63 



4 10 30 

 4 16 49 



4 29 25.5 

 4 35 44.5 

 4 42 03.5 



4 54 41 

 '5 "67 18 



377 



376. 



376.5 



376 



377 



377 



377 



376 



378 



377 



378 



378 



377.5 



377.6 



377.5 



377.5 



379 



377.6 



378 



378 



378.6 



378 



378.6 



378.6 



378.5 



378.5 



379 



378.5 



378.5 



379 



378 



378.5 



379 



379 



378.5 



379 



578.5 



378.5 



Arc register- 

 ed and True 

 Arc 



00=1 42 



1 50 



1 43 



1 28 



1 14 = 1 03 



1 03 



52 



44 = 37 



Mean 

 Interval. 



V377.29 



)>378.65 



Correc- 

 tion for 

 Arc. 



Temp, 

 correct- 

 ed. 



+ 3.03 



-f-1.11 



73.06 



72.94 



Reduc- 

 tion 

 to 72°. 



s 

 + 0.02 



+0.40 



Corrected 



vibrations' 



at 72°. 



86944.85 



86944.85 



85944.85 



On re-admitting the air, the thermometer rose from 72°.6 to 73°.8, and then 

 gradually fell until it took up the temperature of the apartment, which was 

 rather less than 73°.5. After the lapse of half an hour, the following observa- 

 tions were commenced, the glasses remaining on, but a free communication 

 existing with the external air through the exhausting pipe. 



