Up: Glassmaking
Gilbert: 54 of 65
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Experiment 66. To bore a hole in glass.
Place a piece of window glass flat on the
table, pour a little kerosene on the spot to be bored, clasp the
file near the end,
FIG. 86
CUTTING A PANE OF GLASS
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press the end down hard on the spot and turn it
back and forth with a gouging motion (Fig. 87). You twist the file
just as you would twist an awl to force it into hard wood.
You will soon penetrate the surface; use
plenty of kerosene and continue the boring until you are nearly
through; then turn the plate over and start a hole on the other side
to meet the one you have made.
FIG. 87
BORING A HOLE IN GLASS
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Do not rush things; it will take you ten
or fifteen minutes to bore through ordinary window glass.
Bore a hole in a bottle in the same way,
except that the boring is all from the outside.
If the end of the file becomes dull,
break off a small piece, with a pair of pliers, to expose a fresh
surface.
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