ot cutting
because you don't hear it grate, but hold the glass sideways to the
light and you will see the silver line quite continuous.

Having made your cut, take the glass up; hold it as in fig. 11, press
downward with the thumbs and upward with the fingers, and the glass will
come apart.

[Illustration: FIG. 8.]

[Illustration: FIG. 9.]

[Illustration: FIG. 10, A and B]

[Illustration: FIG. 11.]

But you want to cut shaped pieces as well as straight. You cannot break
these directly the cut is made, but, holding the glass as in fig. 12,
and pressing it firmly with the left thumb, jerk the tool up by little,
sharp jerks of the fingers _only_, so as to tap along the underside of
your cut. You will see a little silver line spring along the cut,
showing that the glass is dividing; and when that silver line has sprung
from end to end, a gentle pressure will bring the glass apart.

[Illustration: FIG. 12.]

This upward jerk must be sharp and swift, but must be calculated so as
only just to _reach_ the glass, being checked just at the right point,
as one hammers a _nail_ when one does not want to stir the work into
which the nail is driven. A _pushing_ stroke, a blow that would go much
further if the glass were not there, is no use; and for this reason
neither the elbow nor the hand must move; the knuckles are the hinge
upon which the stroke revolves.

[Illustration: FIG. 13.]

[Illustration: FIG. 14.]

But you can only cut certain shapes--for instance, you cannot cut a
wedge-shaped gap out of a piece of glass (fig. 13); however tenderly you
handle it, it will split at point A. The nearest you can go to it is a
curve; and the deeper the curve the more difficult it is to get the
piece out. In fig. 14 A is an average easy curve, B a difficult one, C
impossible, except by "groseing" or "grozeing" as cutters call it; that
is, after the cut is made, setting to work to patiently bite the piece
out with pliers (fig. 15).

[Illustration: FIG. 15.]

Now, further, you must understand that you must not cut round all the
sides of a shaped piece of glass at once; indeed, you must only cut one
side at a time, and draw your cut right up to the edge of the glass, and
break away the whole piece which _contains_ the side you are cutting
before you go on to another.

Thus, in fig. 16, suppose the shaded portion to be the shape that you
wish to cut out of the piece of glass, A, B, C, D. You must lay your
gauge _anglewise_ do