Prime Conductor.
A metal or metal coated sphere or cylinder or other solid with rounded
ends mounted on insulating supports and used to collect electricity as
generated by a frictional electric machine.
According to whether the prime conductor or the cushions are grounded
positive or negative electricity is taken from the ungrounded part.
Generally the cushions are grounded, and the prime conductor yields
positive electricity.
Probe, Electric.
A surgeon's probe, designed to indicate by the closing of an electric
circuit the presence of a bullet or metallic body in the body of a
patient.
Two insulated wires are carried to the end where their ends are exposed,
still insulated from each other. In probing a wound for a bullet if the
two ends touch it the circuit is closed and a bell rings. If a bone is
touched no such effect is produced. The wires are in circuit with an
electric bell and battery.
Projecting Power of a Magnet.
The power of projecting its lines of force straight out from the poles.
This is really a matter of magnetic power, rather than of shape of the
magnet. In electromagnets the custom was followed by making them long to
get this effect. Such length was really useful in the regard of getting
room for a sufficient number of ampere turns.