Aberdeen herald. [volume] (Aberdeen, Chehalis County, W.T.) 1886-1917, 1916-08-25


parts may be dipped and the brass will
not be affected by the acid, which will,
however, remove all dirt, grease and
tarnish and the brass will come out Of
the bath bright and clean. Can you
give me the formula for this acid bath
and instructions for its use, advising,
also, whether it must be kept in lead or
glass containers?
The parts to be cleaned are first dip
ped into solution of hot I've and then
dipped into what is known as bright
brass dip. This is made up as follows:
Two parts sulphuric acid to one part
nitric acid with tablespoonful of salt
to each three and one-half gallons of
acid. Care must be used in mixing.
Put the sulphuric acid in jar first.
then add the nitric acid. Let this stand
until 1t stops working or Tuning, then
add the salt. The parts to be dipped
should be dipped first into the hot I've
solution and then into the acid solu-
ton. Immediately after the acid dip
the parts should be rinsed in cold wa
ter and given second dip into the
acid and then into the cold water to
rinse them off. After this they should
be dipped into very hot water and
thrown into sawdust to dry.
How can q machine with four square
feet Of head resistance travel faster
than ono with elk equare feet IL the
motor speeds are the same, az are also
the weight Of the machines, horsepo~-
er, gear ratios and size Of wheeIs7
II the motor speeds are both the same
and the gear ratios and size Of wheels
are both the same both machines must
travel at the same speed regardless Of
any other factors.
Why do some Of the manufacturers
leave the intake closed for some time
after the exhaust valve 10 closed? Do
they not cut down on volumstrio eff
cheney by doing so7
The reason for the delayed opening
Of the intake is to create a vacuum III
the cylinder which will cause the inlet
gases to rush in and fill the cylinder.
1t takes a noticeable amount Of suction
to overcome the inertia Of the gases,
and this vacuum is left for the purpose
Of overcoming this inertia
II tho maximum speed Of q motor 10
1900 revolutions per minute, with gear
ratios and horsepower the Same in
both Instances, would reducing the
head resistance increase the speed Of
the car?
If the same maximum motor speed Is
obtained, the gear ratios being con-
slant, the speeds must be equal, but
neither the same maximum car speed
nos the same motor speed would be
obtained in two cars with different
head resistance, but otherwise identi.
-s--v-. --- ... te ssSs.r a..
What IL Tire best paint to use on the
rim of a wheel to keep IL from rust
ing?
Graphite paint is probably the best
to use on the rim Of a wheel to keep
1t from rusting.
have q six cylinder car equipped
with q disk clutch. The car 10 eeared
about three and three tenths to ono
with large wheel, and have expert
enced trouble in clutch sIippase. Not
taking into consideration whether the
clutch IL too small or not properly con-
structed, would lower gear ratio have
a tendency to keep the clutch from
sIippins7
A lower gear ratio would tend to
keep your clutch from slipping. The
reason for this Is that the amount of
energy through any given period Of
time transmitted through the clutch is
less with the lower gear ratio for
given car speed.
There are two factors IN the trans
mission Of horsepower. One Is the
foot pounds Of energy. and the other
is the time. If the time is increased
the foot pounds energy Is decreased.
Since the revolutions per minute can be
considered as time factor It Is quite
evident that In transmitting a given
horsepower through the clutch the en-.
ergy at the clutch will be less when
the speed Of the crank shaft is higher.
What are self lubricating bearings?
Does this self iubricating quality last
as long ss the life Of tho bearine7 For
what special work are they used?
Self lubricatlng bearings are those
in which the fractional qualities Of the
bearing liners are such that they do
not require the use of an additional
lubricant. The self lubrlcating quality
does not always last as long as the
life Of the bearing. For instance. In
the case Of wooden bearings where a
treatment is given the wood by i'm
pregnatiOn with a certain substance it
is often necessary to renew the treat
ment Bearings of phosphOr bronze
and compressed graphite. such as are
used on brake shafts. are claimed to
last the life Of the car.
They have wide variety of uses
for example: In friction shock alb
sorbers Of certain types wood friction
discs are employed which are self lu-
bricating, and in marine work the last
bearing Of the propeller shaft is lined
with lignum vitae. This Is wood
with lubricating qualities. AS stated.
the phosphor bronze and graphite are
used In brake work and often for
spring eye bushings.