Los Angeles herald., 1908-02-02
''& @mkp an Electric BeN 0Hzfz''

is to be u inch deep, and the other TIC
inch deep (see Figs. II and 10).
Procure a round marble "a inch in diane
ter. Take two pieces Of spring brass, inch
long and a inch wide, and screw them into
the recesses, as shown In Fig. IL. Scrape
the end of an insulated copper wire bright
for distance of " inch and fasten it under
the head of one of the screws which hold
the spring. Fasten another wire, in the same
way. to one of the screws of the other spring,
being very careful that the bare part OF one
wire does not touch the other wire or its
spring. Place the marble on the upper
spring, and put the other circle upon 1T, as
shown in Fig. IL, and fasten the two circles
together by brads or screws. =
So much for the push-button.
For the battery, get Mason's preserve
jar 1.-THE one quart size), half dozen electric
light carbons,, 772 inches long and " inch In
diameter, and zinc rod of the same SIZE
For cover take a piece of A-inch wood,
and cut out a circle "a inches in diameter.
In this circle. cut seven holes " inch IN
diameter, as shown in Fig. II, so that each
Of the outer holes is u inch from the hole
in the, centre. You can buy your zinc, al
ready amalgamated,"' at an electrical supply
store; but. if you wish to make it yourself,
take strip Of sheet znc-such as is put
under stoyes-and roll it up as tight as
possible until it is " inch in diameter. Now
it will have to be amalgamated. Get your
druggist to prepare some dilute sulphuric
i
, acid, and wash your zinc in this, and then
rub little mercury all over the zinc which
comes below the surface of the liquid in
the battery. Take your electric light carbons,
coating off, and N inch from the top file
groove around each carbon for the wire to
| lie in If your zinc has not wire already
attached, solder the frightened end OF a
piece of No. 16 copper wire to the top OF
the rod. Pass a carbon through each Of the
outer holes of the cover, SO that the grooved
| ends of the carbons are / inch above the
| top of the cover. Take piece of No. 16
naked copper and wind the end once around
in the groove of one of the carbons, and
then carry it to the next and wind it once
around, and then to the next, and so on
| with all the carbons.
| Into the outer receptacle of glue pot put
some water. and into the inner one put
| maritime candle, and set it on the stove
and let the paraffne melt. Then place, the
tops of the carbons. with the wires, on Them
into it, so that they dip " inch below the
surface, and let them stay three-quarters OF
an hour Istill keeping the glue Pot on ,n.. the
them drain, push them down until they pro-
iect * inch above the cover. Get from the
| druggist five or SIX ounces OF sal amn9Iiiao
| and put it into the jar, and fill it two-thirds
full of water. Put your cover on and let
it stand twelve hours, when it will be ready
for use. Screw your bell up where you wish
to have it, and put your push button up, leav-
ing the wires sticking out where they can be
got at easily Use No. 1S, paraffned, insulat-
ed office wire for running your line. Scrape
the wire bright for a distance of one inch
from the end, and fasten it under the head
of the screw forming one of the binding posts
of your bell. Carry this wire to the push
button. using staples or double-pointed tacks
for fastening it to the wall, and twist the
end of this wire to the end of the wire on
the push button (both, of course, having been
| made bright) and run a wire from the other
wire of the push-button to the wire fasten-
ed to the zinc of your battery and connect
! them together. Then run wire from the
wire connecting the carbons to the bal, and
connect it to the other binding post.
| On pushing the button the bell will COM
mence to ring, and. will continue ringing, as
long as the button is depressed-that is if it
| is not kept ringing more than fifteen minutes
at time. For after being in use more than
| fifteen or twenty minutes at time the
strength of the battery falls rapidly, but re-
gains itself quite as rapidly. when left alone.
| If the bell does not ring loud enough, you
NAV make another cell of battery just like the
first and join the two cells together, being
sure to join the zinc of one to the carbon
of the other. Then connect the free carbon
wire of one cell to the bell, and the free
zinc wire of the other cell to the wire from
the push-button.
Before closing, it will be well to give you
a few hints in regard to your work. Be sure
to follow directions carefully, as the deviation
of one thirty second of an inch may spoil ev-
erything Always, in making connections,
scrape the wires clean and bright at the points
where they are joined. Be careful that the
naked parts of one wire does not touch an
other wire In running wires never put two
wires under the same staple. Do not put
the bell up in damp place.