Print
Word
PDFMr. Jamieson’s propositions have been in great part approved. Some criticisms, however, were made during the course of the discussion, and it is for this reason that the scheme still remains open to improvements. The proposed symbols are as follows:
A.—PRACTICAL ELECTRIC UNITS.
Total resistance of a circuit. R
Internal resistance of a source of current. r_{1}
Resistance of the separate parts of a current. r_{1}, r_{2}, etc.
Specific resistance. [rho]
1 ohm. [omega]
1 megohm. [Omega]
Intensity of a current. C
Magnitude of 1 ampere. A
1 milliampere. [alpha]
Electro-motive force. E
Magnitude of 1 volt. v
Capacity. K
Constant of specific induction. [sigma]
1 farad. [Phi]
1 microfarad. [phi]
Quantity of electricity. Q
1 coulomb. C
Electric work (volt coulomb). vC
Electric effect (volt ampere, watt in one second). W
Horse power. HP
B.—MAGNETISM.
Pole of magnet pointing toward the north.
N
The opposite pole.
S
Force of a pole, quantity of magnetism.
m
Distance of the poles of a magnet.
l
Magnetic moment.
M = m.l
Intensity of magnetization.
J
Intensity of the horizontal component of terrestrial
magnetism.
H
C.—ELECTRIC MEASUREMENTS.
Galvanometer and its resistance.
G
Resistance of the shunt of a galvanometer.
s
Battery and its internal resistance.
B
For dynamo machines, the following designations
are proposed:
The machine itself.
D
Positive terminal.
+T
Negative terminal.
-T
Magnet forming the field.
FM
Current indicator (amperemeter).
AM
Tension indicator (voltameter).
MV
Electro-magnet.
EM
Luminous intensity of a lamp, in candles.
c.p.
Resistance of the armature.
R_{a}
Resistance of the magnet forming the field.
R_{m}
