162 REPORT—1863. 
mass, and time have to be referred to, inasmuch as some writers use the pound 
and some the grain, some the metre and some the millimetre, as fundamental 
units. This cumbrous diction, and the risk of error imported by it, would 
be avoided if each unit received a short distinctive name in the manner pro- 
posed by Sir Charles Bright and Mr. Latimer Clark, in a paper read before 
the British Association at Manchester, 1861. 
TABLE OF CONTENTS. 
Part I.—lyrropucrory. 
1. Objects of treatise. 3. Standard mechanical units. 
2. Derivation of units from fundamental | 4, Dimensions of derived units. 
standards. 
Part I1.—Tue Measurement oF Macnetic PoenoMENa. 
5. Magnets and magnetic poles. 10, Magnetic potentials and equipoten- 
6. Magnetic field. tial surfaces. 
7. Magnetic moment. , 11. Lines of magnetic force. 
8. Intensity of magnetization. 12, Relation between lines of force and 
9. Coefficient of magnetic induction. equipotential surfaces. 
Part I1J,—MerasvremMent or Exrectric PHENOMENA BY THEIR 
ELEcTROMAGNETIC EFFECTS. 
13, Preliminary. on a closed conductor conveying 
14, Meaning of the words “electric a current. 
quantity.” 24. General law of the mechanical action 
15. Meaning of the words “electric between electric currents and 
current.” other electric currents or magnets. 
16. Meaning of the words “electro- | 25, Electromagnetic measurement of 
motive force.” electric quantity. 
17, Meaning of the words “electric | 26. Electric capacity of a conductor. 
resistance.” 27. Direct measurement of electromotive 
18, Measurement of electric currents by force. 
their action on a magnetic needle. | 28, Indirect measurements of electro- 
19. Measurement of electric currents by motive force. 
theirmutual actionononeanother. | 29. Measurement of electric resistance. 
20. Weber's Electro-dynamometer. 30. Electric resistance in electromagne- 
21, Comparison of the electromagnetic tie units is measured by an abso- 
and electrochemical action of lute velocity. 
currents. 31. Magneto-electric induction. 
22. Magnetic field near a current. 32. On material standards for the mea- 
23. Mechanical action of a magnetic field surement of electric magnitudes. 
Part [V.—MrEaAsvrEMENT OF Exectric Poenomena BY Sraticat EFFEcts. 
83. Electrostatic measure of electric ) 41. Absolute condenser—practical mea- 
quantity. surement of quantity. 
34, Electrostatic system of units. 42. Practical measurement of currents. 
35. Ratio between electrostatic and elec- | 43. Practical measurement of electro- 
tromagnetic measures of quantity. motive force. 
86. Electrostatic measure of currents. 44, Comparison of electromotive forces 
87. Electrostatic measure of electromo- by their statical effects. 
tive force. 45. Practical measurement of electric 
38. Electrostatic measure of resistance. resistance. 
39, Electric resistance in electrostatic | 46, Experimental determination of the 
units is measured by the recipro- ratio v between electromagnetic 
cal of an absolute velocity. - and electrostatic measures of 
40. Electrostatic measure of the capacity quantity. 
of a conductor. 
