which use sealing
compound to make a tight joint between the cover and the post have a
hard rubber bushing shrunk over the post. This construction is used in
Gould batteries, as shown in Fig. 10, and in the old Willard double
cover batteries. The rubber bushing is grooved horizontally to
increase the length of the sealing surface.

[Fig. 11 U.S.L. cover]

Other batteries that use sealing compound around the posts have
grooves or "petticoats" cut directly in the post and have a well
around the post into which the sealing compound is poured. This is the
construction used in the old Philadelphia Diamond Grid battery, as
shown in Fig. 254.

Using Lead Bushings. U. S. L. batteries have a flanged lead bushing
which is moulded directly into the cover, as shown in Fig. 11. In
assembling the battery, the cover is placed over the post, and the
cell connector is burned to both post and bushing.

[Fig. 12 Lead bushing screwed into cover]

In older type U. S. L. batteries a bushing was screwed up through the
cover, and then burned to the post and cell connector.

An old type Prest-O-Lite battery used a lead bushing which screwed up
through the cover similarly to the U. S. L. batteries. Fig. 12
illustrates this construction. The SJWN and SJRN Willard Batteries
used a lead insert. See page 424.

The modern Vesta batteries use a soft rubber gasket under the cover,
and force a lead collar over the post, which pushes the cover down on
the gasket. The lead collar and post "freeze" together and make an
acid proof joint. See page 413. The Westinghouse battery uses a three
part seal consisting of a lead washer which is placed around the post,
a U shaped, soft gum washer which is placed between the post and
cover, and a tapered lead sleeve, which presses the washer against the
post and the cover. See page 417.

[Fig. 13 Cross section of old type Willard battery]

The Prest-O-Lite Peened Post Seal. All Prest-O-Lite batteries
designated as types WHN, RHN, BHN and JFN, have a single moulded cover
which is locked directly on to the posts. This is done by forcing a
solid ring of lead from a portion of the post down into a chamfer in
the top of the cover. This construction is illustrated in Fig. 247.

Batteries Using Sealing Nuts. The Exide batteries have threaded posts.
A rubber gasket is placed under the cover on a shoulder on the post.
The nut is then turned down on the post to force the cover on the
gasket. This construction