14 



PROFESSOR FORBES'S EXPERIMENTS ON 



Table V. — {continued.) 







NEEDLE, No 



. L — {continued.) 







Place. 



Date. 



Mean 

 Time. 



No of 



Variations 

 Observed. 



Observed 

 Time. 



Rate 

 Chrono- 

 meter. 



.\rc 



Temp. %°"^^ 

 RpaiiVn Time 100 

 Heaum. vibrations. 



Intensity 

 Paris =1. 



a. j m. 



Gricdelwald;, . . . 



1832. 



Sept. 23. 



h m 



8 50 



100 



24o!l4 



+ 14 



10 



110 



6!5 



2.39.21 



1.072 



Faulhorn, . . • 



Sept. 24. 



8 13 



100 



240.57 



+ 14 



10 



no 



8.0 



249.48 



1.070 



Faulhorn, . • • 



Sept. 24. 



8 22 



100 



240.39 



+ 14 



10 



no 



7.25 



239..37 



1.071 



Engelberg, . . . 



Sept. 27. 



5 22 



100 



241.18 



+ 14 



10 



no 



11.8 



2.39.70 



1.068 



Engelberg, . • • 



Sept. 27. 



5 SO 



]00 



240.54 



+ 14 



10 



no 



10.6 



239.20 



1.078 



Surennes, .... 



Sept. 28. 



10 49 



100 



240.81 



+ 14 



10 



120 



12.8 



239.20 



1.072 



Surennes, . . . 



Sept. 28. 



10 59 



100 



240.99 



+ 14 



10 



no 



12.8 



289.40 



1.071 



Klus, near Altorf, . 



Sept. 28. 



5 24.? 



100 



240.81 



+ 14 



10 



no 



11.8 



239.31 



1.071 



Klus, .... 



Sept. 28. 



6 34 



100 



240.63 



+ 14 



10 



no 



10.7 



239.25 



1.072 



St Gothard, . . . 



Sept. 30. 



8 35 



100 



240.47 



+ 14 



10 



100 



7.1 



239.50 



1.070 



St Gothard, . . . 



Sept. 80. 



8 50 



100 



240.09 



+ 14 



10 



no 



6.3 



2.39.16 



1.072 



St Gothard, . . . 



Sept. 30. 



8 58 



100 



2.39.64 



+ 14 



10 



no 



6.1 



238.76 



1.076 



Locarno, .... 



Oct. 2. 



2 84 



100 



240.20 



+ 14 



10 



no 



18.95 



2.38.50 



1.084 



Ovta, 



Oct. 4. 



K 38 



100 



239.11 



+ 14 



10 



no 



18.45 



236.91 



1.093 



Orta, 



Oct. 4. 



12 46 



100 



2.39.26 



+ 14 



10 



no 



18.85 



237.0 



1.092 



Bellaggio, . . . 



Oct. 8. 



8 5 



100 



238.16 



+ 14 



10 



100 



12.85 



2.36.60 



1.096 



Bellaggio, . . . 



Oct. 8. 



8 16 



100 



238.41 



+ 14 



10 



90 



12.8 



236.82 



1.094 



Reichenau,* . . 



Oct. 10. 



8 32 



100 



240.43 



+ 14 



10 



no 



11.85 



2.38.93 



1.075 



Reichenau, . . 



Oct. 10. 



3 41 



100 



240.07 



+ 14 



10 



100 



11.25 



2.38.65 



1.077 



Wallenstadt, . . 



Oct. 12. 



9 89 



100 



241.01 



+ 14 



10 



no 



12.05 



289.41 



1.070 



Wallenstadt, . . 



Oct. 12. 



9 49 



100 



241.17 



+ 14 



10 



no 



12.4 



2.39.62 



1.068 



Lucerne, .... 



Oct. 15. 



10 11 



100 



240.83 



+ 14 



10 



120 



8.6 



2.39.66 



1.068 



Rigi Culm, . . . 



Oct. 16. 



7 65 



100 



240.71 



+ 14 



10 



no 



3.15' 240..36 



1.062 



Geneva 



Oct. 29. 



12 9 



100 



240.81 



+ 21 



10 



100 



10.96 



288.97 



1.075 



Geneva, .... 



Nov. 10. 



11 33 



100 



240.14 



+ 21 



10 



no 



7.0 



289.14 



1.073 



Geneva, .... 



Nov. 10. 

 1883. 



11 42 



100 



240.00 



+ 21 



10 



no 



7.0 



289.06 



1.074 



Edinburgh, . . . 



May 7. 



4 33 



300 



217.86 



+ 3 



20 



90 



18.13 



270.10 



.841 



Edinburgh, . . . 



May 7. 



4 60 



100 



272.29 



+ 3 



10 



90 



17.9 



269.91 



.842 



Paris,^ 



June 11. 



12 88 



800 



750.94 





20 



no 



20.27 



247.70 



1.000 



Paris,' 



June 11. 

 1835. 



12 55 



100 



250.13 



... 



10 



120 



20.2 



247.67 



1.000 



Edinburgh, . . . 



May 4. 



1 18 



100 



271.8 



.*. 



10 



90 



9.8 



270.42 



.839 



Edinburgh, . . . 



Mav 4. 



1 33 



100 



271.16 



... 



10 



90 



9.2 



270.40 



.839 



Paris, 



June 13. 



3 41 



100 



249.96 



— 40.5 



10 



100 



20.4 



247.62 



1.001 



Paris, 



June 13. 



3 51 



100 



250.0 



— 40.5 



10 



100 



20.16 



247.63 



1.000 



Pic de Bergons, nearl 























Luz, Hautes Py- V 



July 18. 



10 16 



100 



236.26 



+ 20 



10 



100? 



14.76 



284.50 



1.116 



re'nees," . . . j 























Pic de Bergons,* 



July 18. 



10 38 



100 



236.33 



+ 20 



10 



no 



14.2 



234.60 



1.116 



Pic de Bergons,* 



Jufv 18. 



10 51 



100 



236.56 



+ 20 



10 



100 



14.1 



234.82 



1.113 



Luz,'' 



July 20. 



11 9 



100 



285.84 



+ 20 



10 



100 



17.65 



233.74 



1.123 



Luz,'= 



July 20. 



11 25 



100 



285.67 



+ 20 



10 



90 



18.25 



233.54 



1.125 



Luz,'' 



Jul'y 20. 



11 34 



100 



236.08 



+ 20 



10 



80 



18.7 



238.86 



1.122 



Luz,' 



Julv 20. 



11 45 



100 



235.14 



-+ 20 



10 



80 



19.05 



232.94 



1.181 



Pic de Bergons, . . 



JulV 21 . 



10 38 



100 



236.20 



+ 20 



10 



120? 



15.25 



234.34 



1.117 



Pic de Bergons, 



July 21. 



10 47 



100 



236.57 



+ 20 



10 



100.? 



15.0 



234.74 



1.113 



Pic de Bergons, 



July 21. 



10 59 



100 



2.36.17 



+ 20 



10 



110 



15.1 



234.84 



1.117 



Luz, 



July 28. 



11 10 



100 



235.69 



+ 20 



10 



80 



18.85 



233.50 



1.125 



Luz, 



July 28. 



11 23 



100 



235.80 



+ 20 



10 



100 



18.9 



233.60 



1.124 



Gavarnie, .... 



Jul> 29. 



11 52 



100 



235.62 



+ 20 



10 



100 



19.2 



283.38 



1.127 



Gavarnie, . . . 



July 29. 



12 4 



100 



235.60 



+ 20 



10 



100 



19.0 



233.88 



1.126 



Ste Marie, valley of \ 

 Campan, . J 



Aug. 7. 



10 4 



100 



236.19 



+ 20 



10 



no 



19.45 



233.91 



1.121 



Ste Marie, . . . 



Aug. 7. 



10 16 



100 



286.30 



+ 20 



10 



100 



19.3 



234.04 



1.120 



Pic du Midi, . . 



Aug. 8. 



10 4 



100 



285.01 



+ 20 



10 



100 



9.45 



283.88 



1.122 



Pic du Midi, . . 



Aug. 8. 



10 18 



100 



285.13 



+ 20 



10 



no 



9.35 



238.90 



1.121 



Pic du Midi, . . 



Aug. 8. 



10 88 } 



100 



235.19 



+ 20 



10 



no 



9.65 



288.90 



1.121 



Breche de Roland,'* 



Aug. 11. 



10 40 



100 



235.83 



+ 20 



10 



no 



12.35 



233.80 



1.122 



Breche de Roland," 



Aug. 11. 



10 68 



100 



235.34 



+ 20 



10 



120 



12.6 



233.76 



1.123 



' Indifferent observation 



2C 



iroQometer 



very near 



needle. 



3 Chr 



onometet three feet from ueedle. 





* These observations be 



ng not quite 



unexceptio 



aable, owin 



J to a sma 



11 compass 



needle being accidentally retain 



ed in the 



pocket, were repeated thre 



e days after. 



5 



Windy, bu 



t observatio 



n good. 



« Windy. 





' The best observations 



at Luz. 



S 



A knife in 



the pocket. 





' Unexceptionable. 





