Refraction, Electric Double.
Double refraction induced in some materials by the action of either an
electrostatic, magnetic or an electro-magnetic field.
The intensity or degree of refracting power is proportional to the
square of the strength of field.
Refreshing Action.
In electro-therapeutics the restoration of strength or of nerve force by
the use of voltaic alternatives, q. v.
Region, Extra-polar.
In electro-therapeutics the area or region of the body remote from the
therapeutic electrode.
Region, Polar.
In electro-therapeutics the area or region of the body near the
therapeutic electrode.
Register, Electric.
There are various kinds of electric registers, for registering the
movements of watchmen and other service. Contact or press buttons may be
distributed through a factory. Each one is connected so that when the
circuit is closed thereby a mark is produced by the depression of a
pencil upon a sheet or disc of paper by electro-magnetic mechanism. The
paper is moved by clockwork, and is graduated into hours. For each
push-button a special mark may be made on the paper. The watchman is
required to press the button at specified times. This indicates his
movements on the paper, and acts as a time detector to show whether he
has been attending to his duty.
Register, Telegraphic.
A term often applied to telegraph recorders, instruments for producing
on paper the characters of the Morse or other alphabet.
Regulation, Constant Current.
The regulation of a dynamo so that it shall give a constant current
against any resistance in the outer circuits, within practical limits.
It is carried out in direct current machines generally by independent
regulators embodying a controlling coil with plunger or some equivalent
electro-magnetic device inserted in the main circuit and necessarily of
low resistance. In some regulators the work of moving the regulator is
executed mechanically, but under electrical control; in others the
entire work is done by the current.
A typical regulator or governor (Golden's) of the first class comprises
two driven friction wheels between which is a driving friction wheel,
which can engage with one driven wheel only at once. It is brought into
engagement with one or the other by a solenoid and plunger.