1869.] 



Corrections to Pendulum Observations. 



497 



artificial temperatures, embracing a wider range than the natural tem- 

 peratures, but capable of being determined with equal accuracy." 



7. There remains now only to give the results of the experiments made 

 for determining the changes in the number of vibrations of our pendulum 

 produced by varying pressures, and hence the correction necessary to 

 reduce experiments made at any pressure to a vacuum. These results, as 

 given by each separate experiment, are contained in the following Table : — 



Table II. Experiments for determining the number of vibrations made by 

 Eater's invariable pendulum at different pressures. 



No. of 

 experi- 

 ment. 



Full atmospheric pressure. 



About 25 inches. 



About 20 inches. 



Temp. 



Pres- 

 sure. 



Vibra- 

 tions. 



Temp. 



Pres- 

 sure. 



Vibra- 

 tions. 



Temp. 



Pres- 

 sure. 



Vibra- 

 tions. 



86015*87 



8601 5- 99 

 86016*01 

 86016*07 



86016- 10 

 86015*94 



I. 

 II. 

 III. 

 IV. 



V. 

 VI. 

 VII. 

 VIII. 

 IX. 



X. 

 XI. 



o 



47-84 



4777 

 46-33 



46- 25 



47- 72 



47- 9 1 



48- 43 

 47-76 



45- 09 



46- 19 



47- 50 



inches. 

 30-052 

 30*1 12 

 30*182 



29- 938 



30- 460 

 29498 

 29-582 



29- 328 



30- 202 

 30*01 1 

 30-107 



86013*60 

 86013*76 



86013- 82 



86014- 02 

 86013-58 

 86013-64 

 86013-98 

 86014*40 

 8601 3*90 

 86013*99 

 8601 3*61 



45*82 



45-54 

 46*03 



47-I9 

 51-01 

 49*84 



inches. 

 24*632 

 24-634 

 24-620 

 24-599 

 24*651 

 24*646 



86014*57 

 86014*70 

 86014*71 

 86014*49 

 86014*60 

 86014*70 



47°66 

 47*21 

 51*04 

 48*00 



46-47 

 49*00 



inches. 

 19*895 

 19-852 

 19*902 

 19*914 

 19*921 

 19864 



No. of 

 experi- 

 ment. 



About 15 inches. 



About 10 inches. 



Between 7 and 8 inches. 



Temp. 



Pres- 

 sure. 



Vibra- 

 tions. 



Temp. 



Pres- 

 sure. 



Vibra- 

 tions. 



Temp. 



Pres- 

 sure. 



Vibra- 

 tions. 



I. 

 II. 

 III. 

 IV. 

 V. 

 VI. 

 VII. 



43°47 

 44'3° 

 50-07 

 5171 

 47-09 

 46-88 

 54*33 



inches. 



H'563 

 14-567 

 14-532 

 14-680 



I 4'575 

 14-499 



H'555 



86017*91 

 86017 84 

 86018*20 

 86017*95 

 86018-00 

 86017*95 

 86017*93 







5°75 

 45-54 

 47*13 

 48*24 

 49*01 

 5*77 



inches. 

 9*998 

 9*868 

 9*900 

 9-870 

 io*oi 5 

 10*064 



86019*65 

 86019-29 

 8601943 

 86019-60 

 86019-35 

 86019*51 



49°' 3 7 

 54*11 

 51*29 

 50-06 

 53-42 

 48-73 



inches. 



7*586 



7*491 



7-303 



7-554 



7*601 



7-384 



86021*61 

 86021*41 

 86021*30 

 86021*44 

 86021*19 

 86021*58 



No. of 

 experi- 

 ment. 



Between 5 and 6 inches. 



Between 4 and 5 inches. 



Between 3 and 4 inches. 



Temp. 



Pres- 

 sure. 



Vibra- 

 tions. 



Temp. 



Pres- 

 sure. 



Vibra- 

 tions. 



Temp. 



Pres- 

 sure. 



Vibra- 

 tions. 



I. 



II. 

 III. 

 IV. 



V. 

 VI. 







5* -I 3 



47- 86 



48- 90 

 51-30 

 49' 6 3 

 54" '7 



inches. 

 5*461 

 5*420 

 5'5*° 

 ' 5 '403 

 : 5'39° 

 ! 5'489 



86022*10 

 86022*1 1 

 86021*97 

 86021*84 

 86022*19 

 86022*15 







51*07 

 51*17 

 54-o6 



5o-39 

 49*84 



5477 



inches. 



4-241 



4-245 



4-440 



4-53o 



4*107 



4*298 



86022*48 

 86022*71 

 86022*69 

 86022*69 

 86022*37 

 86022*54 







51- 34 

 5°'95 

 50*80 



52- 09 

 54-i6 



53- 70 



inches. 

 3'i44 

 3-J55 

 3*266 

 3*204 

 3*170 

 3*104 



86023*03 

 86022*90 

 86022*94 

 86022*70 

 86022*71 

 86022*95 



