TERRESTRIAL MAGNETIC INTENSITY. 



13 



for correction, and the corrected numbers. These are contained in Tables V. and 

 VL I have thought it needless to incur the labour and expense of printing the 

 individual numbers on which the mean results are founded. They are however 

 preserved in a condition adapted for immediate reference,* 



Table V. 









NEEDLE, No. I. 













PiACE. 



Date. 



Mean 

 Time. 



No. of 

 Vibrations 

 Observed. 



Observed 

 Time. 



Rate 

 Chrono- 

 meter. 



Arct 



Temp. 



Corrected 

 Time 100 

 Vibrations. 



Intensity, 

 Paris =1. 



a. 



m 



Reaum. 





1832. 



h m 





3 



s 







s 





Edinburgh, . . . 



June 2. 



10 22 



300 



817.66 



+ 13 



20 



80 16.4 



270.26 



.840 



Brassels,' . . . 



July 9. 



10 29 



300 



766.67 



+ 17 



20 



70 1 20.5 



262.97 



.969 



Brussels, . . . 



July 9. 



10 63 



300 



766.87 



+ 17 



20 



90 ' 21.6 



262.83 



.960 



Spa, 



Jul> 17. 



5 53 



100 



252.27 



+ 23 



10 



90 17.35 



250.09 



.981 



Spa, ...... 



July 17. 



6 7 



100 



262.80 



+ 23 



10 



90 ; 17.0 



250.69 



.977 



Konigstuhl, near 1 

 Heidelberg, . J 



July 28. 



11 4 



100 



247.60 



+ 23 



10 



90 



17.15 



246.48 



1.018 



Konigstubl, . . . 



July 28. 



11 17 



100 



247.64 



+ 23 



10 



90 



16.75 



245.46 



1.018 



Heidelberg, . . . 



July 28. 



2 24 



100 



247-46 



+ 23 



10 



100 



15.4 



245.51 



1.017 



Bruhl, ..... 



Aug. 1. 



10 65 



100 



251.64 



+ 28 



10 



100 



17.6 



249.28 



.987 



Bruhl, .... 



Aug. 1. 



11 7 



100 



261.76 



+ 23 



10 



90 



17.7 



249.61 



.986 



Bruhl, .... 



Aug. 1. 



11 17 



100 



251.76 



+ 23 



10 



90 



17.56 



249.51 



.985 



Laach, .... 



Aug. 4. 



1 17 



100 



252.71 



+ 23 



10 



80 



21.7 



249.97 



.982 



Laach, .... 



Aug, 4. 



1 33 



100 



262.21 



+ 28 



10 



80 



21.0 



249.62 



.985 



Mont Saleve, near \ 

 Geneva^ . . / 



Aug. 17. 



1 43 



100 



240.61 



+ 20 



10 



110 



17.0 



288.51 



1.078 



Mont Saleve, . . 



Aug. 17. 



1 63 



100 



240.79 



+ 20 



10 



110.? 



17.1 



288.71 



1.077 



Geneva, . , . . 



Aug. 20. 



11 21 



100 



241.17 



+ 27 



10 



100 



21.8 



238.60 



1.078 



Geneva, .... 



Aug. 20. 



11 39 



100 



241.17 



+ 27 



10 



90 



21.9 



238.60 



1.078 



Mont Breven, . . 



Aug, 22. 



2 12 



100 



239.27 



+ 27 



10 



90 



15.7 



237.86 



1.089 



Chamouni, . . . 



Aug. 23. 



12 39 



100 



240.06 



+ 27 



10 



110 



18.4 



287.82 



1.085 



Jardin, .... 



Aug. 2-5. 



12 29 



100 



289.40 



+ 29 



10 



120 



11.0 



237.95 



1.084 



Chamouni, . . . 



Aug. 26. 



1 25 



100 



239.70 



+ 27 



10 



110? 



15.0 



2.37.83 



1.085 



Col des Fours, . . 



Aug. 28. 



9 28 



100 



238.19 



+ 27 



10 



110? 



4.8 



237.43 



1.088 



Aoste, .... 



Aug. 29. 



4 8 



100 



238.71 



+ 27 



10 



130 



16.7 



236.64 



1.096 



St Bernard, . . . 



Aug. 80. 



5 22 



100 



239.07 



+ 27 



10 



120 



6.8 



288.08 



1.082 



Martigny,^ . . . 



Sept. 1. 



8 39 



100 



239.87 



+ 27 



10 



90 



14.8 



238.05 



1.083 



Interlaken, . . . 



Sept. 10. 



4 49 



100 



241.41 



+ 14 



90 



90 



14.3 



239.66 



1.068 



Schmadribach, Val-^ 























ley of Lauter- V 



Sept. 12. 



12 34 



100 



240.11 



+ 14 



10 



100 



12.8 



238.63 



1.077 



brunnen, . . J 























Schmadribach,' . . 



Sept. 12. 



12 44 



100 



239.71 



+ 14 



10 



110 



11.6 



238.25 



1.081 



Grlndelwald, . . 



Sept. 14. 



9 69 



100 



240.80 



+ 14 



10 



90 



14.35 



239.08 



1.074 



Grindelwald, . . 



Sept. 14. 



10 8 



100 



240.51 



+ 14 



10 



100 



14.85 



238.75 



1.076 



Meyringen, . . . 



Sept. 16. 



6 9 



100 



240.70 



+ 14 



10 



120 



12.45 



239.12 



1.073 



Meyringen, . . . 



Sept. 16. 



6 17 



100 



240.31 



+ 14 



10 



110 



11.95 



288.80 



1.076 



Grimsel, .... 



Sept. 17. 



5 57 



100 



240.00 



+ 14 



10 



110 



7.45 



238.96 



1.074 



Munster* (Vallais) . 



Sept. 18. 



5 26 



100 



239.96 



+ 14 



10 



110 



12.6 



288.40 



1.080 



Miinster, . . . 



Sept. 18. 



5 43 



100 



240.04 



+ 14 



10 



100 



10.4 



238.72 



1.077 



Gemmi, summit. 



Sept. 21. 



8 46 



100 



239.71 



+ 14 



10 



120 



9.9 



288.41 



1.079 



Gemmi, . . . 



Sept. 21. 



8 54 



100 



239.83 



+ 14 



10 



12 ) 



9.6 



2.38.60 



1.078 



Friitigen (Kanderthal) 



Sept. 21. 



5 2 



100 



240.66 



+ 14 



10 



110 



J 2.46 



239.00 



1.074 



Friitigen, . . . 



Sept. 21. 



5 11 



100 



240.56 



+ 14 



10 



110 



11,6 



289.09 



1.073 



t a. indicates the initi 



>1 semi-arc of > 



'ibrations ; 



m. the num 



ber of vibra 



tions requ 



ired t 



J reduce it to ha 



If its amoui 



It. 



* Rather windy. 



^ Local dis 



turbance si 



ispected. 



^ Supe 



rior to the 



last. 



* Suspen 



sion not qu 



ite free. 



* Many of the numerical calculations contained in the remainder of this paper, have been made 

 by two of my pupils Messrs Irvine and Edward, under my own inspection and revision. 



