A compound that is almost indestructible is the preparation sold
at art stores as modeling clay. This clay is as easily worked as a
putty and is spread into the tray, which may be of wood or tin,
and the surface leveled by pounding with a mallet or hammer, then
by drawing a straightedge over it.
The surface of the pad is now saturated with pure glycerine. This
is poured upon the surface after it is slightly warmed, covering
the same and then laying a cloth over the pad and allowing it to
stand long enough for the clay to absorb the glycerine, after
which it is ready for use.
The original copy is written with a copying pencil or typewritten
through a hectograph ribbon. A sheet of newspaper is laid upon the
pad and a round stick or pencil is passed over it to make the
surface level and smooth. Remove the newspaper and place the
original copy face down on the leveled surface and smooth it out
in the same way so that every part touches the pad. Remove the
copy in about five minutes and place the clean sheets of paper one
after another on the surface and remove them. From 50 to 75 copies
of the original can be made in a short time.
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