Evening times-Republican. [volume] (Marshalltown, Iowa) 1890-1923, 1920-09-08

1OI UAVhSh WINS
To test the secondary winding OF
an induction coil, connect volt
meter and a six volt storage battery
to the secondary terminals. The
voltmeter should be connected IN
series. that is, break the wire lead
ing from battery to coil pnd attach
each terminal of the ydltmeter to
an end of the wire that is broken. II
the current will not flow from the
battery the winding Is open. II the
winding is In good condition the
voltmeter will show a reading OF half
the storage battery voltage.
3. What Is the best way to turn
car in narrow space or street?
In turning a car In very narrow
street, the advantage is to turn the
front wheels as sharply to the side
as possible. II the turn can not be
accomplished in one operation OF
the steering wheel, do not go for
ward to the curb with wheels hard
to one side but straighten them and
turn them as far as possible In the
opposite direction while tho car Is
still in forward motion q few feet
from the curb. Back the car when
1t has reached the curb, meanwhile
completing the opposite turn Of the
wheel. Before the rear wheels reach A
the other curb In the second opera
ton again turn the steering wheel
to its first turning position and
move the car forward. This should
be sufficient manipulation to bring
tho car In the direction In which
you wish to travel. The forward
and backward motions are similar
to those employed in a garage when
1t 10 necessary to move q car o short
distance to the left or right OF whore
1t stands. and the success OF the
operation depends on proper hand
ling Of the steering wheel.
8. Why must an automobile gaso-
lene engine be cranked before 1t will
produce. driving power?
A gasolene engine must hrst be,
cranked to produce continuous dry.
ing power because gas must be
drawn into the combustion chambers
OF each cylinder, compressed by the
pistons and ignited by sparks at tho
plugs before 1t will expand and give
driving power at the pistons. When
cranking begins, and when the en-
CINE begins operating under its own
power the/action of drawing In gas.
compressihg 1t, igniting 1t and forc-
ing out the burned gasses continues
automatically.
1. What should be done when two
wires are Joined, or when wire is
permanently attached to terminal.
to insure low resistance to the cleo
trio current2
To insure low resistance to now
OF electricity thru joined wires or a
wire permanently attached to ter
ninal always solder such connec-
lions. then tape them. Soldering will
prevent corrosion from adding resis-
1 tence to the current, and will greatly
strengthen the connection.
| s. How should the commutator of
an electric motor or generator be
! treated to produce best operating re-
suits from the motor and producing
results from the generator7
/ Commentators of starting motors
and generators should be cleaned
once or twice season to insure best
results. Loosen up the Dirt or gum
4 on the surface OF the commutator
with kerosene applied carefully with
q cloth. LIFT the brushes while this
is done SO that none OF tho LIQUID will
touch them. When the gummed sur
face is loosened. wipe the commuta-
tor with clean cloth. To maintain
the space between segments Of the
commutator, groove out the mica in
sulation between segments. Start the
j a~.<,k =. 4 y,
then finish underwriting with q hack
saw blade. The mica should be out
a thirty-second Of an inch below the
surface OF the commutator. To
smooth the commutator, use very fine
sandpaper. Lift the brushes and
wrap the sandpaper around the COM
mutator 30 that both ends Of paper
will touch and work back and forth
until bright. Polish with cheese
cloth.
8. OF what material are spark plug
electrodes made? Why can not they
be made Of any metal7
Spark plug electrodes, mainly tho
center point, are made Of nickel alloy.
Most other metals would expand un-
der great heat in the cylinder head
and crack the porcelain insulation
i Of the plug.
Z. What is the best way to test
and adjust q carbureter for high
speed work?
To adjust carbureter for high
speed work cut down the mixture
until 1t is so lean that the motor will
miss on low speed when running idle.
Then add Just a little more gas to
tho mixture. Test the adjustment on
high speeds, quick acceleration and
hill climbing. A weaker mixture can
be used for speed than for heavy or
slow work.
4 8. In reference to the gasolene
automobile. which Is the correct
name to apply to the power plant,
motor or engine?
The more technically correct name
for the automobile power plant Is
the word engine, altho it is popularity
called motor.
9. What is meant by cylinder lap
in engine operation?
Cylinder lap in engine operation
is q name applied to the distance
two pistons travel together on power
stroke. It means the tapping of
power strokes or explosions. In a
four cylinder engine there is an ex-