Los Angeles herald., 1908-09-13

at one end of the battery is lightly twisted
into one Of the platinum wires at the top
of the lamp, that attached to the zinc at the
other end being twisted into the other wire
of the lamp to the operators great satisla gr
| ton the lamp will instantly light up.
either wire is removed it win go. out, and
light up again directly it is replaced,
Now, having got SO far, it is eyiaent .t tnas
we have only got to fix the lamp and battery
in some convenient place, and take wires no on
the battery to the lamp, wherever ~ may pc
But let us first think for a few minutes ABOUT
the lamp itself and the amount OF current
it requires. -, 81
the battery / have mentioned Is aDont
/ "volt"-that is. in this case each cell gives
little more than one volt. the volt being tn me
unit of current. Just as we talk oil pouhu
weight.
less. and, therefore, when you buy your lamp
from the dealer tell him that 1t IS TO pc
"six-yolt" lamp if five-candle power one, OF
"ten-volt'' lamp if an eight-candle power
one. IN
From the battery have described you viii
get about eight volts, and this will work Dotn
| these lamps, the ten-volt lamp not being quite
at its full power.
If brighter light is wanted you can read
ily see that you have to add on another eel-
l. e., jar, porous pot, carbon ana vo |,ro lamn
takes. Il call it volt of current because ~
e easier to understand An electrician will
| tell Won that what it really takes Is one voit
of current of a certain strength, Wnlch -
called the "electro-motive force" OF the pat A.
| tory and always referred to. as 'sE. nj; L.
We'll. then, having mastered these details
! (uhich / have mentioned IN order tnat you
NAV not be disappointed by not being aDle
! to light lamp which really requires iaIeel
amount of 2. M. FL, it is only necessary 70
put up the lamp.
we can have as many lamps of the same
voltage worked from one battery as we hKe,
provided that only one is used at ylIne' -
| is first necessary to provide q sWltch THAI aA
| Is an apparatus for turning the lamps on OF
| N as we want them A ''two-way' switch
/ j. e.. one for two lamps-will cost quarter. /,
1 Having procured one, we now want goou
many wards Of "doube covered wire Nto DC
got from any electrician, and we are tnen
set M. This double covered wire consists
of two separate wires under one cover, lnsu
lated from each other, SO that the current
. cannot pass from one to the, other.
Firstly. settle where the battery Is to gorr
il should go in some cupboard wnere re- y ~ w; =
tbe way. Find a wooden box into which al
the five cells will go, and put them, INTO ~
Il making a hole at one end, out OF winch tne
wire attached to the zlnc may come ana an,
other at the other end for the wire attached
to the carbon.
This having been done, we must ind con-
venient place on some wall near the battery
on which to fix M the switch. which is done
by driving two thin nails through 'ne hoies
made for them into the wall
BEFORE this is done, however, three shorSs
n;aces Of single covered wire are taken, ana
the covering having been scraped on at each
i end. SO as to leave the wire. bare-ths is gone
whenever two wires are 70 pc Jonsu pt.eey
then-one end of each is twisted round the
hrass screws attached to the terminals under
meath the switch.
We now have three pieces Of wire project,
ing from the switch, one OF which IS altacne y
the brass sprinc and the other to the brass
n;Ilar which supports the spring
Now the current has to start from one end
Of tbe battery, go through the spring OF the
switch when it is moved on 70 Sne aagnI 81 ,Ta'
hack to the battery. It sounds very confusing
MT few minutes thought with the switch
in vour hand viii show you how it works.
a niece of the double wire is fastened to
the battery, one wire to each OF those coming
from the zinc and carbon ends OF the battery.
Now cut It off close to the switch, leaving
nlentv Of room to reach it, and scrape the
covering off both the wires as usual.
Now call one lamp A and the other %, and
suppose A is to light when the switch y tar n
the left. The double wire connected with a
must be connected on one side with one Of
The wires coming from the battery, and the
ether wire must be joined to that which Ii
fastened to the pillar Of the switch.
The other wire, fastened to the other pole !
ottached to the terminal on the right side Of
sbe spring Of the switch when it is central
So much for A.
The double wire coming from B is similarly
ia be fastened, one half to the wire from the
. battery and the other to that which is at
tached to the pillar Of the switch, the other
half Of the double wire from the battery be
mo fastened to the wire coming from the ter
minaI on the left side Of the spring, as well
/ as to that on the right SIDE :.
nracfice It only takes few minutes to carry
out and little trouble in considering how
the current travels viii soon clear up any
difficulty.