Up: Glassmaking
Gilbert: 55 of 65
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Experiment 67. To cut a bottle in two.
Wind a strip of blotting paper or wrapping
paper 2 inches wide around the bottle at one side of the line along
which you wish to cut. Make three or more thicknesses and then tie
FIG. 88
BOTTLE READY TO BE CUT IN TWO
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the paper with cord within ½ inch of the edge to be cut. Wrap
another similar piece on the opposite side of the place to be cut
and 3/16 inch from the first piece (Fig. 88).
Now stand the bottle in a pail of water until
the paper is thoroughly wet (about five minutes), take it out, rotate
FIG. 89
HEATING THE BOTTLE
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it in a horizontal position and direct the blowpipe flame against the
glass between the papers (Fig. 89).
Continue this for four or five minutes, then
if the bottle has not dropped apart, plunge it vertically into the
pail of water.
The bottle will break into two parts along the
line between the two papers (Fig. 90). If it does
not do so,
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