Great Falls tribune., 1921-06-19
Safety Lessons
in Autoing

1.-The carburetor vaporizes the
gasoline and mixes this vapor with ali
In certain proportion 70 form an ex-
plosive mixture. For use in automo-
bile engines this mixture is about II
parts Of air to ] part Of gasoline va
por. parts are determined by weight.
If the mixture contains too much gaso-
line it is too rich; this wastes gaso-
line, deposits excessive carbon, dilutes
the oil in the crank case, and prevents
the oil from properly lubricating the
engine. If the mixture contains too
little gasoline, it is too lean; this may
cause the engine to start hard, miss, OF
lack power.
2This proportion of gasoline va
por to air can be regulated by certain
adjustments on the carburetor. These
adjustments are very sensitive and aft
er they are once made properly, there
is little if any need for change Only
properly qualified and experienced per-
sons should attempt to do anything
to or make any adjustment on the car
buretor.
3-No gasoline or air can enter the
engine cylinder without first passing
through the carburetor. Gasoline is
fed from the gasoline tank to the float
. chamber Of the carburetor. Here the
gasoline is maintained at level just
below the end Of the spray nozzle.
ton stroke draws air through the car
buretor into the engine cylinder. This
air passes by the spray nozzle and
sucks out some of the gasoline which
is thus vaporized and becomes mixed
with the air, forming an explosive gas.
4The amount of gasoline and air
entering the cylinders is controlled by
the throttle valve (sometimes called a
butterfly valve) located just above the
carburetor in the pipe leading from
the carburetor to the engine. The
opening and closing Of this valve is
controlled by the hand throttle lever
on the steering post, or BY the foot
accelerator, or by both. Opening the
throttle valve admits more gasoline
and air and speeds up the engine. Less
gasoline and air are admitted and speed
is lowered by moving the throttle to-
ward the closed position.
5rThe engine must ordinarily be
cranked. or turned over several times
before it will start This is because
charge Of gasoline and air must
first be drawn into the engine. then
compressed and fired.
eff the air drawn into the car
buretor. or the mixture Of air and
gasoline coming from the carburetor is
heated before it enters the engine cyl
inders, the cylinder walls are not un
necessarily cooled, and the engine will
operate the more economically.
THE daily waste of gasoline is
enormous. If the drivers in our coun-
try were more careful they could save
over 1.OOO.OOO gallons Of gasoline 4
dow .iy NV Ky hayinU tho f.Drh1,,,a of y
adjusted properly, operating the car
only when necessary and shutting off
the engine when standing still.
S-Street conditions often affect
safe and efficient operation Of auto
mobiles.
9-These conditions include:
(a) Wide streets and narrow streets.
(b) Asphalt. brick. wood block. ma
cadam, sandy, clay. and dirt streets
(wet or dry.
(c) Busy streets. idle streets.
Id Streets with car tracks.
(e) Boulevards and ordinary traffic
streets.
(f) Dusty streets.
(g) Streets with curves and blind
corners.
1O-Drivers should appreciate the
hazards resulting from those conditions
and govern themselves accordingly.
11-Generally speaking, wide streets
are safer than narrow streets: they Of
fer greater space in which drivers can
operate in their endeavors to avoid
running into persons, objects and 9TH
er vehicles.
-. Asphalt. brick. wood block. ma
cadam. sandy. clay and dirt streets
each have different characteristics
that may affect safe driving; rain and
snow make still further changes in the
character Of streets.
(a) Wood swells when wet. Wood
block streets. therefore. should be
watched carefully: the uneven swelling
Of blocks may result in dangerous
bumps and holes.
(b) Moisture forms thin film over
wood blocks and makes them unusually
slippery. s...
(c) Brick streets are liable to be-
come wavy: it is best to drive slowly
on wavy streets.
(d) Brick streets are liable to be
come wavy; it is best to drive slowly
on wayy streets.
(d) Even a slight amount Of mois-
ture makes clay roads dangerously
slippery.
(e) Loose dirt may hide dangerous
holes or cause skidding on macadam
and dirt roads.
13-Drivers should avoid the busi
est streets whenever possible.
14-Car tracks on a street add con-
to the hazard.
(a) If possible. travel streets that
do not have car tracks.
~ Never travel with wheels in car
tracks. 1t wears tires unnecessarily,
and tracks may cause driver to lose
control of car Rails are especially
slippery when wet.
15-Travel boulev3rds where possi-
BILE. Ordinary streets present many
things that confuse the mind of the
average driver: street cars, continual
stopping and starting Of other auto
slow moving vehicles, etc.
16-Excessive dust is dangerous.
Dust particles or small insects in a
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