1904.] 



GOODWIN ELECTROLYTIC CALCIUM. 



391 



that calcium is the fifth best conductor, being surpassed by silver, 

 copper, gold and aluminium, if wires of equal diameter and length 

 are compared, but for wires of equal weight and length the order is 

 entirely different, calcium being second and exceeding silver by 

 •67 per cent., copper by 62 per cent., gold by 86 per cent., and 

 aluminium by almost 20 per cent. This method takes into account 

 the specific gravity of the metals and gives the following order of 

 conductivity : sodium, calcium, potassium, aluminium, magnesium, 

 copper, silver, gold, etc. With purer metal still better results are 

 to be expected. 



Metal. 



Ag 



Cu 



Au 



Al 



Ca 



Mg 



Na 



Zn 



Cd 



K 



Co 



Fe 



Pt 



Sn 



Ni 



Pd 



Th 



Pb 



As 



Sb 



Hg 



Bi 



Spec. Res. 

 cPC. Mic- 

 rohms per cm. 

 Cube. 



1-55 

 1-59 

 2.02 



2.45 

 3-43 

 3.92 



5-04^ 

 5.22 



6.34 

 7.011 



915 

 10.6 

 10.7 

 10.7 

 12.0 

 12.8 

 16.9 

 18.4 



43-1 

 94.0 



[lO. 



Temp. Coef. 



Relative Conductivity. 



Similar Area 

 and Length. 



Similar 



Weight and 



Length. 



.00377 

 388 



365 

 390 



457 



43^^ 

 365 



581^ 



117 



247 

 365 



387 



389 

 93 



100, 



97.6 



76.6 



63. 



45.1 



39-4 



314 



296 



24.4 



22.1 



16.9 



14.6 



14.4 



14.4 



12.9 



12. 1 



9.1 



8.4 



4-7 



3.6 



1.6 



1.4 



32.5 

 37-5 

 13-6 

 80.4 



lOO.O 



75-5 

 "5- 



14-5 

 9-7 



86.8 

 6.8 

 63 

 2.3 

 6.7 

 50 

 3.6 

 2.6 



2.5 



2.8 



1.8 



•4 



•5 



An attempt was made to find the specific heat of calcium, but the 

 iresults are too poor for publication. 



Tensile Strength. 

 From the piece of calcium used in the conductivity test a speci- 

 men was cut with a hack-saw, finished to .458 x. 135 cm. and 

 marked off into half centimeters. The upper end was gripped in a 



'A. Bernini, N. Cimento, 6, pp. 27 and 294, 1903.' 



