Tulsa daily world. [volume] (Tulsa, Indian Territory [Okla.]) 1905-1919, 1917-02-18
Lesson No. 20.
THE NtGNfTo.


\rhc mageuq which we VII now
tic ny is a compound machine De
ius. primarily, q dclicc for maklnE ihc
electric curr. nt but having oIilcI!cI
70 IL the devices for intelrupilns ihl.
current SO that II cen be converter
from low g. high tension ana the d,-
vcos for distributing IL u inc spar"
plues
II We had a magnet, ana We're 70
place piece Of paper on IT, thon
sprinklc some iron fllinfs on TINS
paper and tap the paper thcn these
filings would form themselves IN
definite lines as shown IN flEuTe l.
This is a proof that there are certain
Invisible lines ruunin- lrom one nol'
y the MAGNET To the other pole. Inc
/fact that these lines can maze the
iron filings take definite course or:
in other words, move tho tIllngs ana
the fact that tn" magnet can mt gfeAt
weights. proves that tho" lines nay.
n c-rt2il amount of force. thsneers
CalNulem ma@nctc lines OF force'
by placing Apiece OF IRON callcd
q pole piece. ON the cnd oi ea.h poe.
as shown In Figure =, inc INES OF
force can be made 70 take definite
course as shown instead OF scatter
ing an about the poles IN every dl-
icction.
II is an accepted thc"IN tnat "l'' g..
tricitv does not travel thru the metal
of the wire or conductor but on the
outside, and in sort OF spiral.
could recount 10 You test upon
tCst proving the various actions up"H
which the current sencratine ma
chimes 1re built. but instead ot dolne
this. ! am going 10 ash you 10 use
Nour IMAGINATION ana lei me uS 10
picture the action TO your mind $ eyes.
If.. nf
e. DE exceedingly small pieces OF ru De-
hcr anis extending from pole to pole .
SHppcSo now we inserted con OF
Wirc IN TINS llcId OF pahds as snow d.
and ihcn r"NolNed the con IN the al
i'.ilon OF the arrow
Nhat would h"ppen under the
nhoNo circumstances n.y. me run
her bands would ilnaIIN snap an"
Whip-lash about the wire but the
wire cannot nold them all so thal
many VIII he squeezed along the Wlrc,
and $50 travel along IT. AS last as the
magnetic ines are broken new INES
are formed thus there WIN pe con
siani stream llowlng along tlf Wlie.
.rst as long as the wire Is cutting tnrh
ihc lines. IN othcr words nv makins :
q Wrc cut thru the magnetic INES OF
foi'c the magnetic hncS can ne maze
To- u"NeI along the WireS' or become
electric current
10 was ION th's principle that the
Washct"' the lttle generator Whicu
tnIrrrs your storage huttcrN' ana tuc
me machines IN Inc electrlc
power plant is punt.
Notice that wire "A is cutting thru
thr llnes IN downward d'ecll"h.
while "B' is cutting upward. Thus
tine current Will flow cut of a. say
ana INTO .B on the next nan reVo,
Iulon "A anu ~ VIII nave changed
places, and so the current VIII now
ic tftNellng INTO "A ana out NJ .
Nhlle on the next hhli revolution II
VIII again alternate In direction.
When current in wire is constantly
changing the direction OF How, as
above, we say II is an Alternating cur
rent. The magnetic is an alternating
current machine.
Notice that when the wire is on the
top of ITS revolution II VIII he trdVt!-
ing in the same direction as the mag
nciic lines of force and SO VIII not
cut any Of them. As II revoives a 1T
tie further 1t will cut few in a given
time, the amount of lines cut In Il
gwen time increasing as the wire APP
proaChes the horizontal position
when the maximum number VIII nc
cut. Naturally tho greater the num-
her of lines cut in given time, the
greater VIII ne the fofce -iIcsSll-
them along ;he wire, ana so tue
greater will be the voltage. Note that
the voltage will decrease as the wire
travels stll further, until II gets 10
the bottom, when il viii again IN
crease. but the flow will now be In the
= opposite direction.
AS the magnetic Is butt the wire Is
wrapped around soft IRON core, the
coil Of wire and core being called the
nrmaturc. The armature core has
fastened to each end n shaft, which
runs i'm banhcarings, and so holds the
armature in place, between the pole
pieces one of these shafts also IS
connected to the driving hecnanlsn',;
The magnets are OF nara ste,l anu
Known IS permanent magnets Ihese
magnets will he magnets unul inc emu
of time, but their strength VIII Rrad-
uallv decrease. II nv hccluent thc
current from q battery were 10 run
thru the armature or the maEneto III
certain dlrecton' the mIFhet ~"
viii be quickly drawn out OF the mag
nets. For this reason great care Inust
ne taken III colii'cc,'ilh " ",t'''N -,
tenn Of ignition to q maEneto SystH,,. U,a,.
When the MAGNETS necolne WS,N nv w,
can he remasheti@ep' anu 'hls n.S
some times be necessary IN olueI W
nave the nashelo give suI,Ic'Iut W, ,,
rent to Nleld spark NJ the lpN I"
Iine speeds; -. ,,,.o
FOR slm2Hclly anu IN p'uer w. "a ~
"a