The building of groups, even after the plates and post straps are
secured is a job that requires quite a lot of skill. Before the plates
can be burned to the strap, they must be absolutely parallel, must be
the correct distance apart, and the top surface of the strap must be at
right angles to the surface of the plates.
The Ambu Plate Burning Rack, Figure 15, has been designed to easily
secure the proper conditions. It consists of a wooden base with six
different sets of slots properly spaced which cares for 98% of the
batteries on the market. The guide bar or “comb” on top is slotted to
match up with the base. (See figure 15.)
[Illustration: Figure 15[1]]
The positions of the base and comb are so arranged that the plates are
securely held on opposite corners, at exactly the right distance apart
and are absolutely straight and parallel.
The wooden base prevents the plate proper from coming in contact with
any metal and thus eliminates any possibility of later trouble due to
impurities in the cell.
[Illustration: Figure 16[1]]
In order to accommodate the different sizes and spacings, the comb can
be adjusted vertically and the slots are arranged in groups of different
spacings. These adjustments are flexible enough to allow the setting up
of practically all the various groups used in the different makes and
type of batteries.
Special fittings are provided so that after the plates and post are
properly set a form can be built on the comb which not only locks the
plates in the comb but prevents the hot lead from running off while
burning and makes the finished strap of exactly the proper dimensions to
properly fit into the jar.
For use in the smaller shop the small Ambu Plate Burning Rack, Figure
16, is recommended. It has all the features of the larger rack but the
spacings of the combs limit it to the ^7⁄_{64}" and ⅛" spacings such as
are found in all the popular batteries.
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Footnote 1: