The main action of the machine consists
in the interlocking of the loop, made by the thread carried in the point
of the needle through the cloth, with another thread passed through this
loop by means of a shuttle entering and leaving it at every stitch. The
thread attached to this shuttle remains in the loop and secures the
stitch as the needle is withdrawn to be ready to make the next one. At
the same time the cloth, held by little projecting pins to the baster
plate, is carried along with this by what is called the 'feed motion'
just the length of a stitch, the distance being readily adjusted for
finer or coarser work. .... The cloth is held in a vertical position in
the machine, and the part to be sewed is pressed against the side of the
shuttle-race by a presser plate hinged on its upper edge, and capable of
exerting any required pressure on the cloth, according as the adjusting
screw that regulates it is turned. A slot, or perforation through the
plate, also extended through the side of the shuttle-race near the
bottom, admits the passage of the needle; and when this is pushed in the
shuttle can still pass freely over it.
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