Insulators are not:

• Jartops
• Conductors
• Polecaps
• Transformers
• Nipples
• Isolators
• Glass knobs
• Insulator bulbs
• Targets
• PLO's (P.... Like Objects)
  

• teardrops 
• droplets
• scallops
  
• nibs
  
• beads
  
• nodules
  
• dimples (??)
  
• teeth
  
• hobknobs
  
• drip loops
  
• sawtooth pattern
  
• beaded bottom
  
• drip cones
  
• rim drips
  
• bubbles on the bottom
• drip beads
  
• rain drips
  
• dimpled bottom
  
• rounded teeth
  
• drop points
  
• "pinples" (pimples?)
  
• hobnail bottom, or hobnails
• rippled bottom
  
• "rigid" (ridged?) bottom
  
• pointy things on the bottom
  
• spikes on the bottom
  
• spiny bottom
  
• a ball like edge
  
• little knobby's on the bottom
• little nipples
  
• pebbled bottom
• bumpy things on the bottom
  
• serrated bottom
  
• bottom is fluted
• glass BB ball race on the bottom
  
• hobnail knob things
  
• bottom has a ridged texture
  
• bubble bottom
  
• little bumps
  
• ruffled bottom
  
• sawtooth edges
  
• little bubble thingies
  
• boopy bottom
  
• Beaded Rowels
  
• peakies

• "Oh, you collect conductors!?"
• "Insulators? What are those?..."
• "The reason for all the different colors was to attract different species of birds..... !"
• "They got crackeled from the extreme temperatures in Arizona..."
• "Anything with a patent 1893 "was made that year"
• The Cd128 with CSA; "It stands for Confederate States of America"
• Hemi - 42 in a shop. "It's priced $xx because they are so old and there aren't many."
• "I don't buy them for the shop anymore because no one is interested in insulators"
• "The cobalt and green ones turned that way because of sunlight"
• "They turned purple because of the magnesium in the glass"