Robisons Manual of Radio Telegraphy And Telephony for the Use of Naval Electric

Cover Robisons Manual of Radio Telegraphy And Telephony for the Use of Naval Electric
Robisons Manual of Radio Telegraphy And Telephony for the Use of Naval Electric
S S Samuel Shelburne Robison
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Etc.
MANUAL OF RADIO TELEGRAPHY AND TELEPHONY. 77 The coulomb, being one-tenth of the absolute unit, =3x10® electro- static units.
The electro-magnetic unit of potential is -g^ of the electro-static unit.
In both systems a condenser is said to have unit capacity when unit quantity of electricity charges it to unit potential.
From the definition of a farad, given in art. 121, we see that the quantity of electricity in a condenser equals in coulombs the potential Q in volts multiplied by the capa
...city in farads, or Q = EC, . '. C= -p . Sub- stituting for Q and E their unit values in electro-static units given 3X10* above, C = ^ = 9x10", or the practical electro-magnetic unit of capacity is 9 x 10" times as large as the electro-static unit.
The capacity of spherical bodies is found to vary as their radii, and in the electro-static system a sphere of 1 centimeter radius has unit capacity; therefore the capacity of a sphere may be expressed by its radius in centimeters, and capacities are still expressed by some writers and manufacturers by the radius in centimeters of the equivalent sphere.


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