Recalescence.
A phenomenon occurring during the cooling of a mass of steel, when it
suddenly emits heat and grows more luminous for an instant. It is a
phase of latent heat, and marks apparently the transition from a
non-magnetizable to a magnetiz able condition.
Receiver.
In telephony and telegraphy, an instrument for receiving a message as
distinguished from one used for sending or transmitting one.
Thus the Bell telephone applied to the ear is a receiver, while the
microphone which is spoken into or against is the transmitter.
Receiver, Harmonic.
A receiver including an electro-magnet whose armature is an elastic
steel reed, vibrating to a particular note. Such a reed responds to a
series of impulses succeeding each other with the exact frequency of its
own natural vibrations, and does not respond to any other rapid series
of impulses. (See Telegraph Harmonic.)
Reciprocal.
The reciprocal of a number is the quotient obtained by dividing one by
the number. Thus the reciprocal of 8 is 1/8.
Applied to fractions the above operation is carried out by simply
inverting the fraction. Thus the reciprocal of 3/4 is 4/3 or 1-1/3.
Record, Telephone.
Attempts have been made to produce a record from the vibrations of a
telephone disc, which could be interpreted by phonograph or otherwise.
Fig. 284. MORSE RECORDER OR EMBOSSER.