When without a glazier’s diamond make a stout wire or thin iron rod red
hot and draw a line with it, very lightly, where you want the glass
cut; unless it is very thick glass it will snap off quite easily. And
for opening a bottle that is too tightly corked, instead of breaking
the neck and splintering the glass, take a piece of string and soak it
in turpentine, tie it tightly round the neck of the bottle where you
wish it broken off, then set fire to the string, and the glass will
snap off easily at the heated line.