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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