772 INDEX OF SUBJECTS. 



PART II. ELECTRICAL MEASUREMENTS. 

 CHAPTER I. ELECTROMETRY. 



PAGE 



General Characteristics of Electrometers 166 



Gold Leaf Electroscope 166 



Graduation of Electrometers 167 



Classification of Electrometers 169 



Coulomb's Balance 170 



Measurement of Masses or of Potentials 171 



Influence of the Case of the Electrometer 175 



Thomson's Absolute Electrometer 178 



Quadrant Electrometer 183 



Method of Oscillations 191 



Methods Based on the Properties of the Spark 193 



Striking Distance 194 



Influence of Pressure on the Striking Distance 199 



Measurement of Charges by the Spark 199 



Capillary Electrometer 201 



CHAPTER IL MEASUREMENT OF CURRENTS. 



Different Methods 204 



Absolute and Relative Sensitiveness 205 



Galvanometers 205 



Method of Torsion 206 



Method of Oscillations 208 



Sine Galvanometer 209 



Tangent Galvanometer 210 



Berlin's Arrangement 214 



Galvanometers of Joule, Gaugain, Helmholtz, Weber 215 



Ordinary Galvanometers 216 



Artificial Field 218 



Astatic Needles 219 



Bifilar Suspension 219 



Damping 219 



Nobili's Galvanometer 226 



Weber's Galvanometer 227 



Thomson's Galvanometer 227 



