Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1920-11-14
.SIMPL|F|ED LESSONS IN
CARE OF AUTOMOBILE
Expert Gucrrlich Describes High
Tension AIcgncto in an In
sfructivc Lecture.
Lecture No. 2Ia.

Lecture No. cIa.
magnetic we saw that this required
an outside coil. with number OF
wires to connect the two. 1t would
DO fine thing II this coil: with It's
wires, could he eliminated. as not
only does the coil take up room, but
the wires may become loose, short
circuitcd, either by oil, by the insula-
uon becoming worn, and, in brief
rentors and designers saw tho ad-
vantage of doing away with this coil
and It's wiring, with the rcSul; that
the high-icnsion magnetic was in
vented.
Let us study the hightcmsion
magnetic system. which is, perhaps.
the ideal ignition system. In study
place of the inventor and develop
the system as he would be likely to.
We want to do away. with tho
transformer coil. What is its pur-
nose? Its purpose is 10 transform
the low voltage current into high
voltage current. Well, can the mag
iieto be SO built that it Will generate
- current OF voltage high enough
40 give tho spark, without using n
transformer coil? No. because II
cannot he made large enough. We'll.
then. can tho coil be bull, into the
magnetic?
Let us SEQ what the coil is made
II. 1t is made of soft iron core,
around which arc wound few
number of turns of wire, carrying
great number Of turns OF wire. into
which the high-voltaGe current il
induced by the intcrrupting OF tho
low tension. or primary current. But
notice this. The magnetic armaturc
- also u soft iron core and has wrap.
ped about IL number of turns OF
wire, the construction ana wiring OF
5Shc two cores being as shown in
1
sturc core and make IL takc the place
.,of the transformcr-coil core, also!
The core already has primary wind
ing on il. so that only the secondary
wiring will be necessary.
This can be done. AS because the
current generated on the armature
must be interrupted when II is "a
Maximum. which Will be when IN.
core is in a vertical position. and AT
right angles to the magnetic lines
OF force. The magnetism from inc
Held of the magnets Will not inter
fcrc with the demagnetization OF the
core: and, also, as the secondary cur
rent flows Immediately after the rri-
mary current is interrupted. or when
primary circuit Will be open and so
the interrupter points are open, the
Two currents will not interfere
with one another.
Now the secondary coil is revolving
and so in order TO collect this cur
rent u collector ring and collector
brush must be furnished, This is
srmnturc shaft, opposite to the side
the intcrruptcr Is on.
y Fig. =. shows the wiring Of the
hish,tenslon ma ,S. is c the and
Slieavy lines j represent the sccon-
gblary coil tof which there will be a
greater number OF turns. me pr,
ION the armature coil, goes through IL,
ihen wire l.. which is practice. Is
ihar placed as shown by .. then across
I Ia. St,tp
SS'nd so through the ground BACK To
SIGNATURE, ut =.
{. The secondary VIII start In the sec
hrEdary. coil on the armature, go 10
tihc collaborating, be collected by the
4 collector brush, and then so through
~. 10 the distributor. and so TO the
ipnrk plugs. returning through the
ground 10 the arInaturc At I.
Tracing the Two circuits, We find
TAT GmG end ,S Of ths nr'M MhSh is
generated on this winding viii go
10 the primary collector, then TO the
interrup;sr and then nc to ths , ground
the metal of the magnetic itself. Thc
sHcondary. which is also grounded at
@i.e end, VIII go 70 the collector rinE, ,
- 10 the distributor. by which i, is
distributed TO tho various wires run,
.n; to the spark plugs, ana VII
The engine and magnetic To where The
secondary coil was Srounded. The Tn,
thin lines represent the primary ana
heavy the secondary.
Notice mat the only wires which
leave the instrument CAS- the inter
rup,er and distributor arc built into
outsidc) are those which so 10 tho
spark plug. This is truly a simple
machine.
How can We stop the magnetic from
causing spark AT the spark plug
80 as TO stop the engine: You VIII
note thnt tn" primary curr"n; SocS
across tho intrrrupter points TO the
- ound. For this reason i! a wire be
connected "a the culinary. circuit be-
fore The !u;crruptcr points. and runs
20 q switch and' from the switch To
The ground, there Will bc II circuit for
the current even when the inter-
ruptcr points open. and so these
points Viii he imperative and the
Notice that tn. hiGh-tension mag
ncto switch makes contact 10 stop
tlon from all other ignition switches.
Fig. shows the outside wiring.
of tho axle on the rish;-hand from; whecl
broke close TO tho hub with an clean i
freak If you cut banana with sharp
,tnifc. y mechanic t'Ghtenen UP the wheel
zen days ago. standing on the wrench TO
10 So Was this correct. or what caused
The break? {. T. q.
a. An averag. mechanic can se, ,,u,
light enough by using the standard iron
wrench 10y hand. and often viii get the
ar lcngthening the wrench by using p!per
ctc. However. l doubt that this was tn.
ease with you, getting this nut 100
ugh: would b- IA. more likely to cause
!, crushing OF tn" hearings than q. break
N the stronger spindle
q. have 1915 Ford car l. ,.las
;,noU, fifteen minutes every morning "a
start IL aUu hav" 20 I'M 81, ian ~ eas
hen :" start u , Tut in n7w '.In"-
-,-ssts'----.sessr- 1sss
\ y