The daily morning oasis., 1919-08-24

: hOlnl IN the top OF a pillar post
of the old battery. Then he lit
his flame and in a few moments
he had twisted off the links and
was busy opening up one of the
: cells.
"Now I'VE are gatting down in
to the heart of the battery" he
said. "These are not mere de-
tails that we will consider now.
They ave the essential, vital
characteristics, the real features
that make a battery good or
bad. Let us have look at this
clement" and donning his rub
Der gloves he pulled out the
dripping plates.
} ''Hello!" he exclaimed. "This
is interesting. The last man who
repaired this battery tried to
twist off that terminal the same
way that l did, and instead, he
twisted the pillar post right off.
See where it has been mended ?
That is the natural thing to hap
pen, but it can't happen in the
Philadelphia Diamond Grid Bat
terry. Here is why and pick
ing it tup from his work bench a
strap and pillar post, he fitted
them into a top cover, placed
over the post the little rubber
washer with the octagonal hole
in it, slipped it down so that it
fitted snugly over the octagonal
part of the pillar post and held
it out to the customer.
81 sea-" said the customer
with interest. eff you tried to
twist off that terminal (do you
call itO, the rubber washer
would hold the main part solid.
That is Ia great idea.'
"While we are on the subject
of the construction of this pillar
post" said the service station
man, "come take another look at
your battery. You see how the
case has been damaged by acid.
You may be curious to know
how that acid got out of the box
Here is the answer. Look at
that post. You see, in the course
of the vibration that this bat
terry has endured on it's many
travels that post has worked
loose from the sealing compound
that was around it. It works it's
way along surfaces. The acid
crapt up that pillar post and out
over the top of the battery and
down on to your wooden box"
"Well, acid will creep in that
battery just the same way,
won't it?" asked the customer.
"No, sir! acid cannot creep out
of this battery" answered the
service station man. "This is
why. You see those ridges
around that pillar post? We call
those petticoats.' Now when
that sealing compound is poured
into the battery, it is boiling hot
and very fluid. 1t flows in around
those petticoats and lodges tight
ly in all of the ridges. 1t locks
so tightly that it cannot be brok-
en- loose by any amount of jarr-
ing and the acid can't find a
straight path up that post. 1t
would have to go in and out of
all those ridges. Furthermore,
acid has boiled out of the filler
caps on your battery. That is
because there was not enough
gas space under the cover and
because there was no definite
point at which you should stop
filling when you added water.
Now look at the Philadelphia
Diamond Battery. In the first
place the moulded cover provides
ample gas space so that when
the electrolyte swells in volume
due to the natural formation of
gas in it while the battery is
charging on the car, there is
plenty of room to take up the
increase without the electrolyte
boiling out. In the second place,
the filling tube moulded in the
cover gives you a definite height
to which to- fill and to prevent
any acid splashing out when you
go over bumpy roads or swing
around a corner"
"Well," said the customer.
"That sounds like the most
scientific battery that I have
ever heard of, but how about the
separator? I have had to have
a number of separators put into
my battery in the last eight
months. I seem to have had par
L.