S. H. M.
Symbol or abbreviation for "simple harmonic motion."
Shock, Break.
A term in electro-therapeutics; the shock received when an electric
circuit, including the patient in series, is broken or opened.
Synonym--Opening Shock.
Shock, Electric.
The effect upon the animal system of the discharge through it of
electricity with high potential difference. Pain, nervous shock, violent
muscular contortions accompany it. Of currents, an alternating current
is reputed worse than a direct current; intermediate is the pulsatory
current.
The voltage is the main element of shock, amperage has also some direct
influence.
Shock, Static.
A term in electro-therapeutics. The application of static discharges
from small condensers or Leyden jars to a patient who is insulated from
the ground with one electrode applied to the conducting surface on which
he rests, while the other, a spherical electrode, is brought near the
body so as to produce a disruptive or spark discharge.
Short Circuit.
A connection between two parts of a circuit, which connection is of low
resistance compared to the intercepted portion. The term is used also as
a verb, as "to short circuit a lamp."
Fig. 304. DIAGRAM ILLUSTRATING SHORT CIRCUIT WORKING.
Short Circuit Working.
A method of working intermittently an electro-magnet so as to avoid
sparking. It consists in providing a short circuit in parallel with the
magnetic coils. This short circuit is of very low resistance. To throw
the magnet into action the short circuit is opened; to throw it out of
action the short circuit is closed. The shunt or short circuit must be
of negligibly small resistance and inductance.