ELECTRICITY. 40 



(66) SPECIFIC RESISTANCE OF LIQUIDS IN B.A. UNITS. 



Vhe resistance usually decreases rapidly as the temperature rises. 

 Waterat-75'C. ) ( 1-188 X 10 s 



,, at 4 C. VAyrtonand Perry I 9'1 X 10 s 



atllC. ) ( 3'4 X 10' 



Dilute hydrogen sulphate at 1 8 C. (5% acid A 1 '033) 



(Kohlrausch) 4'SS 



'Dilute hydrogen sulphate at 18 C. (20% acid Al '1414) 



(Kohlrausch) 1-562 



Dilute hydrogen sulphate at 18 C. (30% acid A 1 '22) 



(Kohlrausch) 1-38 



Dilute hydrogen sulphate at 18 C. (40% acid A 1'31) 



(Kohlrausch) 1'5 



Hydrogen nitrate at 18 C. A 1'32 (F. Kohlrausch) ... 1'61 



,, at 14 C. A 1-36 (Blavier) 1'45 



at24C. A 1-36 1'22 



Solution of copper sulphate atl6C.(8% salt) (Blavier ?) 437 



(16% salt) 30-0 

 (28% salt) 23-4 



,, ,, ,, at 10 C. (saturated) (Ewing)29 -3 



Solution of zinc sulphate at 18C.(257 salt)(Kohlrausch)21*l 

 ,, at 14 C. (saturated) (Blavier) 21'5 

 ,, at24C. ,, 17'8 



Hydrogen chloride (20% acid All) at 18C. (Kohlrausch) 1'34 

 Ammonium chloride (25% salt A 1'07) ,, 2*53 



Calcium chloride (25% salt A 1 '23) ( Kohlrausch) 573 



Magnesium chloride (20% salt A 1'176) ,, 7 '28 



Sodium chloride (20% salt A 1*148) ,, 5'2 



(26-4% salt A 1-2) ,, 473 



,, ,, solution saturated at 13 C 5'3 



Zinc chloride (30% salt A 1 -3) (Long) 11 '0 



(67) RESISTANCES OF TELEGRAPH CABLES PER NAUTICAL MILE 

 IN B.A. UNITS. 



Red Sea cable at 24 C 7'94 



Malta-Alexandria cable at 24 C 3'94 



Persian Gulf cable at 24 C 6*284 



Second Atlantic cable at 24 C 4 '272 



A copper wire weighing one kilog. pure at 24 C 554 



An iron wire 4 mm. in diam. weighing 185*5 kilog.... 167 



(68) SPECIFIC RESISTANCES OF NON-METALS IN B.A. UNITS. 



Selenium (crystallised) at 100 C 6 X 10 l 



Tellurium at 20 C 0'207 



Tellurium at 19-6 C. (Matthiessen) 0'2125 



Red phosphorus at 20 C 132 



