It is a difficult ware to make, for
unless the workmen are skilled at giving the clay an even pressure it
is liable to be thicker in some places than others. Sometimes, too, if
the seams are not strongly united the article will crack. It demands a
strong, even touch. Remember that hollow ware is pressed from the
outside; and that flat ware is just the opposite, and is pressed from
the inside. The top surfaces of such things as plates, platters and
trays are thus formed, their outer side being shaped by hand or by a
jolly, which we shall see presently."
Mr. Marwood passed on through the crowded room until he suddenly
paused beside a workman at another machine.
"This," explained Theo's conductor, "is a jigger. There are two
machines very commonly used in the United States for shaping the
cheaper wares: one is a jigger, a device of this type; and the other a
jolly, an invention very similar in construction but having a tool
attached that forms the outside, or bottom of the piece, the inside of
which has previously been shaped by the jigger. You may recall that I
spoke of the jigger; and told you how a revolving mould was inserted
into it, and how afterward a sheet of clay was laid on the outside of
this mould and rapidly shaped.
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