ON STANDARDS OF ELECTRICAL RESISTANCE. 159 
Derived Mechanical Units. 
LM 
7 Forces Fa 
1 
Derived Magnetical Units. 
Work=W= Velocity =V= 
Strength of the pole of a magnet 
Moment of a magnet ...........-+: m=L2 T M* 
Intensity of magnetic field.......... H=L?T 'M* 
Electromagnetic System of Units. 
Quantity of electricity ............0. Q=1? x Mi 
Strength of electric current .......... c=? Tut 
Mveniromotiye force... esse es tee ne E=1? TMi 
Resistance of conductor ...........++: R=L T’ 
Electrostatic System of Units. 
Quantity of electricity ....,........- q=lL? TMi 
Strength of electric currents .......... c=L? T > M? 
Electromotive force ...........+005- e=Li Ty? 
Resistance of conductor..,..,,.....++ r=L 'T 
Let v be the ratio of the electrostatic to the electromagnetic unit of quantity 
(35 and 46); then v=310,740,000 metres per second approximately, and we 
have 
se 
e= HE ] 
v 
q=vQ c=vC | r=—R s=v'8 
v 
Table for the Conversion of British ( foot-grain-second) System to Metrical 
(metre-gramme-second) System. 
aa of Number of 
tri its British units 
caiatact ie a ea Log: acacia a 
British unit. metrical unit, 
Se , | 0°0647989 || 2:8115678 | 11884321] 15-43235 
. |2° for L, - ie and V..| 0°3047945 || 1-4840071 | 0-5159929)| 3-280899 
3°for F (also for foot-grains| 0-0197504 || 2 2955749 | 1-7044250) 50-6320 
and metre-grammes). 
SA 0:0060198 || 3:7795820 | 22204179) 166-1185 
5° for H and electro-|0-461085 || 16637804 | 0-3362196|| 216880 
chemical equivalents. 
meron, C, ande ...... 0:140536 || 1-1477874 | 0-8522125| 7-11561 
7 for E, m, q, and c .. , .| 0°0428346 | 2-6317949 | 1:3682051) 23-3456 
oo) 0:0359994 || 2-5562953 | 1-4437046| 27-7782 
