glass insulator pendant lights
Vintage, electrical glass insulator hanging candle holder.
BED SPRING AND INSULATOR VOTIVE
Hemingray 45 glass insulator hanging candle votive.
http://www.indemandjoboccupations.com/howtobecomeanhvactechnician.php has some information on the job duties and training needed to become a a HVAC technician.
glass insulators - Glow
Old electric glass insulators on copper pipes = unique garden art (plus if you put wings on them, they could be "bugs")
fun desk lamp from old glass insulator
Repurpose Glass Light Insulator