TABLE OF CONTENTS 



Introduction xxxi 



Units of measurement xxxi 



Fundamental units, xxxi ; derived units, xxxii. 

 Conversion factors and dimensional formulae xxxiii 



Geometrical and mechanical units, xxxiv; heat units, xxxvi; 

 electric and magnetic units, xxxvii ; electrostatic system, 

 xxxviii ; electromagnetic system, xxxix. 

 Fundamental standards xli 



Standard of length, xlii ; standard of mass, xlii ; standard of time, 

 xlii ; standard of temperature, xlii. 

 Numerically different systems of units xliii 



Proposed systems of units (Table I), xliii; Gaussian systems, 

 xliii ; " practical " electromagnetic system, xliv ; the inter- 

 national electric units, xliv. 

 The standards of the international electrical units xlvi 



Resistance, xlvi : Mercury standards, xlvi ; secondary standards, 

 xlvii ; resistance standards in practice, xlvii ; absolute ohm, 

 xlvii. 



Current, xlviii : The silver voltameter, xlviii ; resistance stand- 

 ards used in current measurements, xlix ; absolute ampere, 

 xlix. 



Electromotive force, xlix : International volt, xlix ; Weston 

 normal cell, xlix ; Weston portable cell, li ; absolute and 

 semi-absolute volt, li. 



Quantity of electricity. Hi : Standards, Hi. 



Capacity, lii. 



Inductance, lii : Inductance standards, lii. 



Power and energy, liii : Standards and measurements, liii. 

 Magnetic units liii 



The ordinary and the ampere-turn magnetic units (Table II), liv. 



TABLE PAGE 



1. Spelling and abbreviations of common units of weight and measure. 2 



2. Fundamental and derived units, conversion factors 3 



(a) Fundamental units 3 



(b) Derived units 3 



3. Tables for converting U. S. weights and measures : 



( 1 ) Customary to metric 5 



. (2) Metric to customary 6 



4. Miscellaneous equivalents of U. S. and metric weights and measures. 7 



