G.S. unit, except for time and angles;
(4) finally, decimal multiples and sub-multiples of these practical
units, that are in current use.
The committee likewise decided always to adopt a large capital to
designate the physical magnitude; a small capital to designate the C.G.S.
unit, when it has a special name; a "lower case" letter for the
abbreviation of each practical unit; and prefixes, always the same, for
the decimal multiples and sub-multiples of the practical units.
Thus, for example, work would be indicated by the letter W (initial of
the word); the C.G.S. unit is the _erg_, which would be written without
abbreviation, on account of its being short; and the practical units
would be the kilogrammeter (_kgm_), the grammeter (_gm_), etc. The
multiples would be the _meg-erg_, the tonne-meter (_t-m_), etc.
Mr. 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.
Pages:
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89