employ one of the other methods.

_How to Transfer the Cutting-line on to the Glass._--Take a bit of glass
large enough to cut the piece you want; place it, face upwards, on the
table; place the cut-line over it in its proper place, and then slip
between them, without moving either, a piece of black "transfer paper":
then, with a style or hard pencil, trace the cutting-line down on to the
glass. This will not make a black mark visible on the glass, it will
only make a _grease_ mark, and that hardly visible, not enough to cut
by; but take a soft dabber--a lump of cotton-wool tied up in a bit of
old handkerchief--and with this, dipped in dry whitening or powdered
white chalk, dab the glass all over; then blow the surface and you will
see a clear white line where the whitening has stuck to the greasy line
made by the transfer paper; and by this you can cut very comfortably.

But a third way is to cut the shape of each piece of glass out in
cartridge-paper; and to do this you put the cut-line down over a sheet
of "continuous-cartridge" or "cartoon" paper, as it is called, and press
along all the lines with a style or hard pencil, so as to make a furrow
on the paper beneath; then, after removing the cut-line, you place a
sheet of ordinary window-glass below the paper and cut out each piece,
between the "furrows" leaving a _full_ 1/16 of an inch. This sixteenth
of an inch represents the "heart" or core of the future _lead_; it is
the distance which the actual bits of glass lie one from the other in
the window. You must use a very sharp penknife, and you will find that,
cutting against _glass_, each shape will have quite a smooth edge; and
round this you can cut with your diamond.

This method, which is far the most accurate and craftsmanly way of
cutting glass, is best used with the actual diamond: in that case you
feel the edge of the paper all the time with the diamond-spark; but in
cutting with the wheel you must not rest against the edge of the paper;
otherwise you will be sure to cut into it. Now, whichever of all these
processes you employ, remember that there must be a _full_ 1/16 of an
inch left between each piece of glass and all its neighbours.

The reason why you leave this space between the pieces is that the core
of the lead is about that or a little less in thickness: the closer the
glass fits to this the better, but no part of the glass must go _nearer_
to its neighbour than this, otherwise the work will be p