Evening star., 1922-07-23

once you have mastered the art OF
small talk, you do not need an auto
mobile to run down your neghbors.
what Kind ss Camper Are Ysuf
Thi, In the season when the shadow
cd byways have their greatest lure
for the motorist camper.
Choice spots near puritng streams
the seQuestered woodland nooks-are
occupied by picnickers.
Spread upon the ground II the
snowy cloth. Nearby there In the
bulEing lunch basket with its bounty
of delicaeies.
Laughter and merry-ma king
pickles and sandwiches-cake and
(candy--the Jared salads-a treasure
Tho time dies. The least romantic
member OF the party consults his
watch Heavens. It's late.
| The party hastens to leave.
| There is hasty but careful gath
ering up of picnic equipment and the
lremains of the luncheon. Things for
future use are packed away. Others
are burned or buried in \ proper
place.
| Another party. also preparing to
the things for tonight's use But the
picnic ground 1t leaves behind.
| Cardboard plates. pickle and salad
dishes are left where last used. the
| glazed tissue paper In which the cakes
were wrapped Is blown about by we'll
are everywhere. Apple cores ond bot
ties and empty sardine cans are on all
sides.
The party leaves for home.
| Home. Well ordered. inviting home.
And in place Of the delightful wood
/ oh nj
| picturesque picnic ground. the pic
! nickers leave behind a garbage and
| refuse strewn grove, attractive only to
| the flies.
Which kind of a motorist camper
are you?
High-Gear Hill Climbing.
| The high-gear hill climber 10 first
cousin to the scorcher and both are
bound to become wiser as time goes
These statements are made with the
full understanding that the modern
automobile Is made to climb almost
anything but trees. But to climb a
steep hill on the high gear imposes
| the engine but also on every other
part Of the car. The lower-gear
ratios are provided for hill climbing
and they should be used for 1t.
| Consider the amount Of work per-
formed by An automobile climbing a
| gradient on, say, a gear ratio OF three
| to one. A ratio OF three to one means
| that one revolution of the rear wheels
| is produced by three revolutions OF
the engine shaft. With the lower
gear ratio, the intermediate and the
low. the number of engine revolutions
| the number Of road-wheel revolu-
| tions.
1t is not so dimcult to compute with
exactness the distance which = car
is propelled by one explosion In the
| engine cylinder and the power consumed
Of a thirty-two-inch wheel 10 ap-
proximately 100 inches, and in cover
ling one mile the wheels revolve 633
times With the motor turning over
three times as fast Is the road wheels,
it will require 1899 revolutions OF
mile. Thus. II such car should
proceed at the rate of thirty miles per
| hour, approximately $50 engine reVo-
lutions per minute are required. With
two power strokes at every revolu-
| tion, there are 1900 revolutions per
car one foot and four and a haif
| inches.
] This estimate assumes that the car
| be propelled over level ground TO
\ mount hill simply means that grade
resistance is added to the various
automobile weighing 1000 pounds
climbing a hill 200 feet high (meas-
ured vertically simply performs the
task Of overcoming the action OF
| gravity. or lifting. and the calculation
| Of the power required to do this must
horsepower unit is derived. To lift
| ooo hounds 200 feet high in one
minute is the same thing as lifting
1000 10000. 900 pounds one foot
high in one minute. Theoreticaliy.
.hen, the lifting Of 1000 pounds so2 zoo
l212 horsepower. and the losses
through friction. air resistance. ETC.
consume the remainder OF the theo-
retical horsepower output
| From all this it must become ap-
parent that rushing up steep hill on
the high gear must subject any ia, car
to enormous stresses. which are nkeiy
to AFFECT the life and service OF the
car to a considerable degree.
| Varying OAoneters.
Now and then tourists who closely
watch their odometers when they
travel fihd fault with the mileases
given in the touring data they are
lusing. They frequently claim the
imileaRes are wrong because the same
do not agree with the instrument on
their own machine. 1t rarely seems
to occur to them that it may be the
other way about, nor do they take
Into account that their tire imitation
has a material influence on their mile
age. As a matter of fact, those who
collate touring routes and informa :
ton make it a point to watch the tire
imitation because of it's influence on
the progressive mileage OF the day
work.
More than this, the instruments used
on the pathfinding cars are carefully
tested as to accuracy with variation
allowance of percentage.
| There Is another factor that applies
to any instrument and on the same
car going over the same route. There
| is a possibility Of a two-thirds varia-
ton from these causes. When the
trip dial is set for the beginning 1t
lmay be overset just a little SO that
iit will run out Of the first tenth be-
| fore that distance has been covered.
and at the end of the journey the
anal tenth may either underrun or
overrun. This latter condition. how
ever, is not the one that makes the
material difference sometimes COM
The real factor is the cross-area in
nation Of the tire. A four-inch tire
In slated for eighty pounds. ThiA