ocr: B G) E - - - Ahe C JOHN GREENWOOD THOMAS GRYLL D 1760-1819 fl.1800 E F OHN GREENWOOD was born in / ANY OFthe Boston. He was dentist to * wealthy H President George Washington. In people in Roman 1790, Greenwood created the first times had a water free-standing dentist's drill, and supply and needed K incorporated his mother's spinning a faucet to control it. The water pipe L wheel into the design. The first they used containedacylinder with M electric drilla appeared 85 years later. ahole in it- by tuming the N. cylinder, the water was shut off. In 1800, Thomas Gryll, an iron- monger from Engl ...
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