Besides, it is a simpler matter to clean such a jar than
one that has a small opening.
[Illustration: FIG. 4]
23. JAR TOPS AND COVERS.--While the tops, or covers, for glass jars are
made of both metal and glass, as has been stated, the glass tops meet
with most favor. Of course, they are breakable, but they are even more
durable than metal tops, which are usually rendered less effective by
the bending they undergo when they are removed from the jar. Covers made
of zinc are being rapidly abandoned, and it has been proved that the
fewer the grooves and the simpler the cover, the more carefully and
successfully can it be cleaned. For safety, glass tops that have become
chipped or nicked on the edges that fit the jar should be replaced by
perfect ones. The covers for automatic-seal jars must be pierced before
they can be removed, and this necessitates a new supply for each
canning. If there is any question about the first-class condition of jar
covers, whether of metal or glass, tops that are perfect should
be provided.
24. JAR RUBBERS.--Jar rubbers are required with jar tops to seal jars
air-tight.
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