He thinks that a telephone operating at great distances must differ
from a city apparatus, and that an instrument for transmitting song
can not be absolutely the same as one for conversational purposes. So
he has endeavored to create types that shall prove appropriate for
these different applications.
* * * * *
DECISION OF THE CONGRESS OF ELECTRICIANS ON THE UNITIES OF
ELECTRIC MEASURES.
For these measures there are adopted the fundamental
unities--centimeter, gramme, second, and this system is briefly
designated by the letters C., G., S. The practical units, the _ohm_ and
the _volt_, will retain their present definitions; the ohm is a
resistance equal to 10^{9} absolute unities (C., G., S.), and the volt
is an electromotive force equal to 10^{8} absolute unities (C., G., S.).
The practical unit of resistance (ohm) will be represented by a column
of mercury of 1 square mm. in section at the temperature of 0 deg.C. An
international commission will be charged with ascertaining for
practice, by means of new experiments, the height of this column of
mercury representing the ohm. The name _ampere_ will be given to the
current produced by the electromotor force of 1 volt in a circuit
whose resistance is 1 ohm. _Coulomb_ is the quantity of electricity
defined by the condition that in the current of an ampere the section
of the conductor is traversed by a coulomb per second.
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