DISTRIBUTED CAPACITY.--See Capacity, Distributed.
DOUBLE HUMP RESONANCE CURVE.--A resonance curve that has two peaks or humps which show that the oscillating currents which are set up when the primary and secondary of a tuning coil are closely coupled have two frequencies.
DUO-LATERAL COILS.--See Coils, Inductance.
DUPLEX COMMUNICATION.--A wireless telephone system with which it is possible to talk between both stations in either direction without the use of switches. This is known as the duplex system.
EARTH CAPACITY.--An aerial counterpoise.
EARTH CONNECTION.--Metal plates or wires buried in the ground or immersed in water. Any kind of means by which the sending and receiving apparatus can be connected with the earth.
EDISON STORAGE BATTERY.--See Storage Battery, Edison.
ELECTRIC ENERGY.--The power of an electric current.
ELECTRIC OSCILLATIONS.--See Oscillations, Electric.
ELECTRIC SPARK.--See Discharge, Spark.