TABLE OF CONTENTS. 



Introduction: units of measurement, dimensional and conversion formulae, 



standards: xxiii 



General discussion, xxiii; Fundamental units, xxiii; Derived units, xxiv; Con- 

 version factors and dimensional formulae, xxv; Dimensional reason- 

 ing, XXV. 



Dimensional formulae: xxvi 



Geometrical and mechanical units, xxvi; Heat units, xxviii; Electric and mag- 

 netic units, xxLx; Electrostatic system, xxx; Electromagnetic system, xxxi. 



Fundamental standards: xxxiii 



Standards of length, xxxiv; Standards of mass, xxxiv; Standards of time, 

 xxxiv; Standards of temperature, xxxiv. 



Numerically different systems of vmits: xxxv 



Proposed systems of units (table I), xxxv; Gaussian systems, xxxv; Practical 

 electromagnetic system, xxxvi; International electric units, xxxvi. 



The standards of the International Electric Units: xxxviii 



Resistance, xxxviii: Mercury standards, xxxviii; Secondary standards, xxxix; 



Resistance standards in practice, xxxix; Absolute ohm, xxxix. 

 Current, xl: Silver voltameter, xl; Resistance standards used in current 



measurements, xli; Absolute ampere, xli. 

 Electromotive force, xli: International volt, xli; Weston normal cell, 



xli; Portable Weston cell, xhii; Absolute and semi-absolute volts, xliii. 

 Quantity of electricity, xliv: Standards, xhv. 

 Capacity, xliv. 



Inductance, xliv: Inductance standards, xliv. 

 Power and energy, xlv: Watt, xlv; Standards and measurement, xlv. 



Magnetic units, xlv: Table II. — The ordinary and ampere-turn units xlvi. 



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: 



(i) Customary to metric 5 



(2) Metric to customary 6 



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



