The silver state news. [volume] (Winnemucca, Nev.) 1907-1909, 1909-01-16
THE ELECTRIC CURRENT AMI
SOME OF ITS HOUSEHOLD
APPLICATIONS
Continued from Page ~


also is the magnetic. A current to take
the place of all the local batteries is
furnished by a storage battery at the
central station. This system is conse-
quently called the central-energy sys
tenn.
In this system when subscriber
wishes to call up central, he has only to
lift the receiver from it's hook. This
closes the circuit and lights up a small
glow lamp on the switch board in FROM
of the operator. Central calls up the
desired subscriber by means of an al
ternating current from her magnetic.
AS soon as the subscriber replaces his
receiver upon the hook the small glow
lamp is out. This is, therefore, a no.
tice for central to d%isconnect the W
lines.
/ must speak of one more sounding
or signaling device-the electric door
bell. The electric door bell is a simple
application of the electro-magnet. Ii
was probably the first application of
electricity to household purposes. A
current suitable for operating electric
door bells is usually obtained from two
or three dry cells. If the house is al
ready wired for electric lighting, the
ordinary 110-volt alternating current
may be used, provided a new device
called the Robinson bell ringer is used.
The important factor in electro-mag-
nets is the readiness with which the
core becomes demagnetized on breaking
the circuit. When the bell circuit is
closed by a push button, the current
flows around the BELLS electromagnetic
which. becoming megnetized, attracts
an iron bar, one end of which forms a
a bell claper. This jerks the clapper
against the bell plate and at the same
time breaks the circuit. The break
stops the current and the eleetro-mag-
net, having lost its magnetism, allows
a spring to pull the clapper back to It's
former position thus restoring the cur
rent and the same work is repeated.
In both bell and telephone work, the
batteries used to supply the currents
are now almost exclusively dry cells
They are cleaner, easier to handle, an
more compact than the wet batteries
They are also very cheap. The bat
terry may be placed in a back closet and
, the wires led from it along the skirt.
ing board. If the sight of the wires is
Objectionable, they can be covered by
an ornamental casing. One wire from
the battery leads directly to the bell
, the othre wire leads first to the push
) button and from that to the bell. In
connecting up the wires and the push
! button, the ends of the wire should
first be Frightened by sa~ndpaperine
them and they are. then wound closely
about the shank of the binding screw
! Then the screws are frightened up tt
{ clinch the wire firmly. Lay the wire
4 around the posts from left t o r light
This will insure a good tight contact
when the binding screw is firmly
screwed down upon the wire
Unless these contacts are made
and kept clean and tights
unnecessary resistance is intro
dueed into the circuit. Trouble some
times arises from the fact that the con
tact in the push button gradually be
a. -.
comes corroded. The fault is remediet
by taking the cover off the button am
scraping the contact points. Care mus
also be taken that the current does no
leak through the wires at some poinI
7 or other because of their poor insula
: ton. The use of "weatherprof' No
Is copper wire saves most of tn,
trouble on this score. The dry cell
, will nave to be renewed about once
! year.