NUMERICAL CONSTANTS. 



Elements of Terrestrial Magnetism. 



At Paris, January ist, 1886. 



Declination ........... 16 3*5' 



Inclination ........... 65 157' 



Horizontal component ....... 0*1943 



Vertical ,, ....... 0-4217 



Total force ........... 0*4644 



Maximum Intensity of Magnetisation. 

 Iron ......... 1400 



Soft Steel ....... 780 



Cobalt ........ 800 



Nickel . . ...... 494 



COEFFICIENTS OF MAGNETISATION. 



Diamagnetic Bodies. 



Values calculated, taking 14*6. io~ 6 for bismuth. 



Glass .......... 0-135. io~ 6 * 



Wax .......... 0*38. 10 ~t 



Zinc .......... 0*56 O'I7 



Ether .......... 0-56 



Absolute Alcohol ...... 0*58 0*53 



Camphor ........ O'6i 



Linseed Oil ....... 0*63 



Olive ,, ........ 0-64 



Pitch .......... 0*65 



Nitric Acid ........ 0*65 



Water ......... 072 0*67 



Solution of Ammonia .... 073 



Bisulphide of Carbon .... 074 0*89 



Sulphuric Acid ...... 077 



Sulphur ......... 0*87 076 



Chloride of Arsenic ..... 0*91 



Fused Borate of Lead . . . . 1*02 



Lead .......... 1*03 



Phosphorus ........ 1*24 i.io 



Selenium ........ 1*25 ni 



Copper ......... I '27 



Silver ......... 174 



Gold .......... 2'6o 



Solutions. \ 



Density. Coefficients. 



Water ............ I -0-67.10-" 



Chloride of Sodium ........ 1*2080 -075 



Chloride of Magnesium ...... I '3 I 97 -o'8i 



* FARADAY. Experimental Researches, Vol. in., p. 497. 



f E. BECQUEREL. Ann. de Chim. et de Phys. [3], Vol. xxvm., p. 283. 1850. 



E. BECQUEREL. Ann. de Chim. et de Phys. [3], Vol. XLIV., p. 209. 1855. 



