My father had the Barrett drum machine in his shop in the mid-1950's, along with the spindle-mounted radius grinding machine. Grinding the linings would fill the shop with stinky asbestos dust, but that was long before it became fashionable to swoon over that kind of hazard. I was also around when a bunch of fast-talking salesmen in the 1980's were hawking all sorts of Rube Goldberg devices to catch and dispose of brake dust during a repair job, at a time when most of the the mechanics were chain smoking filtered cigarettes and filling their lungs with microscopic bits of fiberglass filter material.
Jerry
