710 



RESISTANCE MEASUREMENT 



high and insulation 



juices, 200 

 direct deflection method. 



201 



loss of charge method, 209 

 Megger, Everehed, 213 

 voltmeter method, 208 

 low resistance measurement. 



190 

 Kelvin bridge, Thomson or, 



191 

 \\heatstone bridge method. 



190 



potentiometer method for 

 resistance measurement >. 

 157 



substitution method, 156 

 volt ammeter method. l.V. 

 \\lieatstonebridge, 1.J 

 slide wire form, 17J 

 Resistance pyrometer, 224 

 Resistance standards, 131 



low resistance for alternating 



current work, 137 

 compensation for inductance 



of, 139 

 national physical laboratory 



form, 140 



Reichsanstalt form, 137 

 Resistance wire, manganin, 129 

 Resistance of part of permanently 

 closed circuits, measurement of, 95 

 Resistivity, conductivity, methods 



of stating, 227 



aluminum, resistivity of, 232 

 copper, resistivity of, inter- 

 national standard, 230 

 per cent, conductivity, 232 

 Resistivity temperature constant, 



230 

 and temperature coefficient of 



resistance, 231 



Resonator, Fleming and Dyke, 424 

 Rheostats, 145 



carbon compression, 153 

 immersed wire, 150 



Rheostats, water, 145 

 \\ire, 150 



Rosa, E. B., curve tracer, G17 



Notary standard watt-hour meter, 

 portable standard watt-hour me- 

 ters, 495 



Ryan, H. J., power diagram indi- 

 cator, 326 



S 



Sangaino 



ampere-hour meter, 487 



watt-hour meter, 488 

 Secohm meter, 389 

 Self inductance, measurements, see 

 Inductance and capacity, meas- 

 urement of, 341 



standards, 344 

 Sensitivity of galvanometer 



ampere, microampere. 20 



megohm, 22 



normal, 21 



volt, microvolt, 21 

 Shielding, magnetic, 8, 22 

 Shunts, 51 



Ayrton and Mather universal, 

 52 



for ballistic galvanometer, 122 



low resistance, for alternating- 

 current work, 137 



switchboard, for ammeters, 



57 

 Siemens electrodynamometer, 76 



setting up of, 77 

 Siemens and Halske 



synchronizing lamps, 544 



voltmeter, high range, 258 

 Slide wire, calibration of, 178 



bridge, 172 



Soft iron instruments, 69 

 Solenoidal inductor, 106 

 Spark gap 



needle point, 260 



A.I.E.E. table for, 261 

 humidity effect on, 263 



sphere gap, 263 



