as a lock to prevent the post from turning.
This applies especially to the two terminal posts to which the cables
are attached. The washer is intended to prevent any strain in the
cable from turning the post and breaking the seal between the post and
the compound.

New Development in the Philadelphia Battery

[Fig. 256 Cross section new type Philadelphia battery]

[Fig. 257 New type Philadelphia Diamond Grid Battery]

Rubber Lockt Seal Covers. During the last few years there has been a
marked tendency in the battery industry to do away with the use of
sealing compound for making a joint between the cell cover and the
terminal posts and to substitute a mechanical seal of some kind at
this joint. The Philadelphia Storage Battery Co. has developed the
"Rubber Lockt". cover seal, the construction of which is shown in
detail in Figs. 256 and 257. On the cell posts there is a. flange
which supports the cover, and above this there is a recessed portion
into which is slipped a soft rubber sleeve or bushing. This portion of
the post is made with a ridge extending around the post and with the
rubber sleeve forming a high point over which a corresponding locking
edge in the terminal hole of the cover is snapped. This construction
makes a joint which is flexible and at the same time acid tight.
Vibration tends to push the cover down on the supporting flanges, as
the post diameter is smaller below the locking edge. The design is
simple, both from the assembly and the repair standpoint, as no tools
are required for either operation. In the assembly operation the
groups are lined up so that the post centers are correct and, after
wetting the soft rubber sleeves, the cover is snapped in place with a
quick downward push. See Fig. 258. In removing the covers, catch under
each end with the fingers and pull upward, at the same time pressing
with the thumbs on the top of the posts. See Fig. 259.

[Fig. 258 Replacing cover of Philadelphia Diamond Grid Battery]

[Fig. 259 Removing cover of Philadelphia Diamond Grid Battery]

Rubber Case Batteries. Another development of recent years consists of
the replacing of the wood case and rubber jars by a one-piece
container of hard rubber with compartments for the elements The
Philadelphia Storage Battery Co. has developed the Diamond Rubber
case, which combines strength and lightness with an attractive
appearance. See Fig. 260. One of the troubles experienced with the
earlier desi