It's strange how my memory works. Yesterday this thing just popped into my head. I never actually had one, but I remember them as coming in different shapes. So, I did a Google search and sure enough it found one. Google is amazing.
Remember when the windshield wipers ran on manifold vacuum? Did they slow down when you stomped on the gas?
Don[/QUOTE
Yes, my first few cars wipers ran off vacuum hoses. The wiper transmission was in the car above the windshield. When going down a hill, I would pull off one of the hoses to my my glass pack mufflers backfire. You could hear me coming a long ways off.