Evening star. [volume] (Washington, D.C.) 1854-1972, 1919-11-16

since the full atmospheric pressure Is
acting at the air inlet A. air Is push
ed by it into the carburetor, past the
throat or contracted portion OF the
mixing chamber. past the throttle T
| (here shown closed but assumed to be
somewhat opens. through o. past the
engine inlet-valve and into the cylin-
der. thus filling the latter. The wider
open the throttle is and the faster the
piston moves. the faster the air flows
into the cylinder. The float chamber
C is kept filled with gasoline through
the supply-pipe K TO the level of the
dotted line by the automatic action
of the buoyant float F and the needle
valve B. controlling the fuel entrance
D, this action being similar to the
control of the water level in the or.
binary bathroom tank.
AS liquids in connected vessels seek
the same level. gasoline always fills
the standpipe ] almost to its open
upper end. which is located in the
narrow part Of the mixing cham
Der. AZ explained above, when pis-
ton is on it's intake stroke the air
in the connected intake piping IS
somewhat rareded and partial
vacuum exists around the open mouth
of standpipe ]. The full atmospheric
pressure Is. however, acting In c and
the result Is that gasoline 10 forced by
it out of J. the mouth of which (the
spraying nozzle) is SO constructed. in
practice a. to break up the liquid
into hnS drops AS the speed Of the
high, the gasoline spray is caught up
LakhHsDf IL; mingled with il and to q,
III SAxtAnt the LIQUID 10 actually
f[Sxt0siSsd, The faster air 10 called for.
EhEnpSh3a4 the throttle ana speeding
M. TIE engine. the stronger the
ftowTof gasoline from J to mix with
the. (which Is rushing past on Its
WHY 10 the cylinders, 90 that there 10
some tendency toward keeping the
proportion of air and gasoline con.
should be- kept in order to secure
proper engine operation. This ton
dency Is. however. insufficient to meet
practical requirements. for the reason
that the flow OF gasoline through a
with increasing suction. than does
the dow of air through an orifice OF
given size under the same changes OF
suction. the result being that II q
rudimentary carburetor. such rs this.
is arranged to furnish a correct mix
ture of air and gasoline for an on
gine running at low speed, when such
an engine Is accelerated, too much
gasoline in proportion to air Is then
delivered and the mixture becomes
wastefully overrich and lacking in
power production properties. It 10 ne
cessity for correcting this inherent
difficulty in mixture quality regula-1
ton, SO as to secure the correct pro-
portions of gasoline and air At all
speeds and throttle openings. that has
made 1t necessary to introduce the
various complications found in prac-
tical carburetors. Some OF the methods
of automatic mixture proporttoning
will be explained in later articles.
-ampering With Starters.
While modern cars have adequate
| means for locking the ignition switch
and preventing unauthorized starting
of the engine, there is generally
nothing to prevent the starting motor
from being operated and the engine
from being turned over. Thus the
electrically equipped car Is at the
mercy Of the ever-present small boy
and the curious or mischievous mad
dler, to the extent not only of having
it's battery exhausted. but of having
it's starter drive mechanism badly
damaged. Many strange cases OF run
down batteries and of broken n.y.