Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1916-10-15
the spark Will be timed to come II,

the spark Will be timed to come Il,
the correct time.
Instead OF running IL wire from the
rotor TO the battery. the current Is al
lowed TO travel through the metal of
the engine, or ground" In the Ford
cars the cam shaft liz carried through
the front OF the engine and the rotor ia
fastened to it's end. Thus the current
will return through this cam shaft.
then Its bearing and so through the
rest Of the engine TO Il point whore a
wire from TIA battery or magnetic fast
,cned 10 it. so as to collect the current.
The secondary current also returns
through the ground from the spark
plugs. so that there must be wire
from the coil to the engine to collect
this returning secondary current. The
manufactures. however, desiring ITO
simplify the wiring as much as Is pos
sible uses the primary wire running
from the coil TO the timer for this
purpose. TO do this. the primary and
secondary are connected aS shown.
Please note that the connecting OF
the primary and secondary Is done only
to save n wire. By tracing the two
circuits you will see that even though
Connected the primary cannot run
through the secondary circuit. nor the
secondary through the primary. accept
Ling; along the wire from the timer to
the coil. AS the secondary current
comes after the primary Is interrupted.
the two Will not flow At the same time.
and. moreover. when the secondary is
flowing the interruptcr points are open.
while the primary has not u high
enough voltage to jump across the
spark plug points $50
| The tOndcnsrr.
The moment the intcrruptcr points
open. thus stopping the flow Of the
current. the voltage 1T the points viii
build up so high az TO jump across the
4 No.. 4,
across :. spark will come. which will
be so hot az To soon burn out th.:
| points. Thus, wr must have some de-
! vice to prevent this. For this purpose,
what TX known ns II condenser Is used
Let US see why the voltage is bull,
up. II We had u Ions coil Of pipe
| through which water was howing AT
slight pressure and II at the Lar
end we tried TO stop the How ~ the
, water by closing UP the opening we
you'd lind that We would require uui'e
a it'll. effort, far more than tue pres
sure under which the water is now
ing. TO stop it. why? because when
We stop the water. that at the open
inE has the great amount OF water III
back of II which must also be stopped.
Now il takes a resistance or pressure
10 stop anythnG which has weirht
from moving. ana as the water AT lhc
opening must stop the foot oil "hter
just IN back Of il and also the root oil
water IL, back Of that, and so on, you
can see how the pressure on the water
at the opening viii become very great
II wc tried to close the opening WIN
a piece OF cardboard. tn. prcssur"
might build up 80 high as to hurst
! through this cardboard. even though
| II were strong enough 10 resist tht
! fow % the water when at rest. II ws
| were TO use Il technical expression, We
| would say that the pressure was due
{ l.. = tt,n n
/ We have the same condition i'll the
! primary circuit when the intcrrupter
points arc opened. only instead OF water
! downing in pipe Ne have electricity
| flowing through "a wire. and instead
/ of putting ii piece Of cardboard al inc
/ opening. we put sheet of air there
! that Is. the air between the points when
t.they are open We see. therefore. that
we must have something In the circuit
! which will absorb this momeutary nigh
! pressure. The condenser is used for
! this purpose.
y condenser Is made Of two or more
! sheets OF tinfoil which are separated hy
sheet Of Insulating wax paper. Thes"
arc then rolled into IL bundle. and q
| wire connected to one Of the sheets
I and 10 one side Of the interrupter, while
| another wire is connected To the other
/ side OF rho points and the other piece
.-af ;infoil. When the points are sud
/ denly opened. instead Of the current
humping across the points II Will trPye!
10 the tinfoil. and not being able 10
| get across because Of the insulating
| paper. will be collected. sort OF stored