Cutting glass bottles the easy way. Relies on motor oil and a heated steel rod.
MOTHER EARTH NEWS #23 Sep 1973 pg. 83
Build a hot-wire glass-bottle cutter and companion scoring jig.
POPULAR ELECTRONICS [2] Dec 1990 (v.7#12) pg. 36
Added Info POPULAR ELECTRONICS [2] Feb 1991 (v.8#2) pg. 4
Technique for cutting glass bottles or jars using electric heating element wire and a battery charger.
POPULAR WOODWORKING #69 Nov 1992 (v.12#3) pg. 7