Evening star., 1921-11-27

pipe are Objectionable, as 1t would
likely create back-pressure or pre-
vent the free escape of burned gases
pressure cuts down the power Of an
engine by mixing with the fresh
charge of fuel and therefore should
be avoided.
s. Change Of speeds of car is made
possible through tfe transmission by
meshing in turn various sized gears
For low speed gear on the main
shaft is shifted into mesh with a
smaller gear on the countershaft.
For second speed smaller main
shaft, gear is meshed with a larger
in most cases the same sliding gear
used for providing second speed is
again used, this time the gear being
brought into mesh with the main
| driving gear. When the two. are
locked together the drive is direct; or
the shaft leading to the rear axle
! .evolves at the same speed as the en-
gine cfankshaft. -
6. A dual ignition system consists
! of two systems of ignition, mag
| neto and a battery and coil, indie
, ing the same set of spark plugs.
! Double ignition is two independent
ignition systems. each having its own
set of spark plugs. Two-spark igni-
! tion is system having one source of
! current. such as magnetic with two
plugs which are both fred at the
same time. The double system can be
operated to fire either one or both
spark plugs in cylinder at time.
Z. Wash away the mud which fills
the spaces between cells Of radiator
as soon as possible. These spaces
! being the means of cooling the
water as. it passes through the
radiator. they should be kept free
from clogging or overheating of the
the radiator direct a stream of water
! from a hose through the cells from
! the rear toward the front-never the
opposite way Water directed from
the front of the car toward the in
side of the hood may temporarily
prevent the ignition system from
| functioning. by soaking the wires
and sbort-circuiting the. system.
| 8. Although the storage battery
may be charged a good part of day
still become discharged if much
night driving is done. or if the start
er is used too frequently. The rate
| of discharge and the length of time
that the battery was being discharged
| would exceed the amount of charg-
ing. resulting in weakening the bat
! terry.
i 9. The three-quarter floating axle
used in many cars of today was de-
vised as a compromise between the
| sesses some advantages of both the
latter. The. two former types were in
use first, the former coming into exist
ence only in late years.
| 10. The burned or blackened ap.
pearance Of commutator in an cleo
! trio generator may be caused by high
mica between the copper segments OF
the commutator. by wrong size OF
| brushes, brushes too loose or short
circuited winding of the generator
An overload on the generator or al
open circuit may also cause the
trouble.
| This Weeks Questions.
1. Should an engine start harder
| or require more time in cranking in
cold weather than when it is warm?
2. When the starter continues to
lrevolve after the starter button is re-
leased. what is the trouble?
| 3. How often should brushes of a
generator be examined or cleaned?
| l. Should a new cars engine be
drained of oil and cleaned oftener
! than an engine which has had a great
| deal of use?
| 5. What is brake horsepower of an
engine?
| 6. Can a straight side tire be mount
! ed on clincher rim?
| Z. What can be used to clean brake
bands and remedy their squeaking?
| s. How can sparkplug threads be
| treated so that the plug can be re-
moved easily? How tightly should
; the plug fit the cylinder?
| 9. What is meant by loading up
J OF a carburetor?
| 10. How can better cushioning be
obtained from tires. without debating
| them below the specified number of
pounds pressure required?
| Copyright. 1921. Thompson Feature Service. -,