Stooky Bill was the name given to the head of a ventriloquist dummy that John Logie Baird used in his early experiments to transmit a televised image between rooms in his laboratory at 22 Frith Street, London.
"Stooky" or "stookie" is Scots for stucco or plaster of Paris, or for a plaster cast used to immobilise bone fractures. The term is also used someone who is slow-witted or awkward in his movements. The incandescent lights illuminating the subject to be televised generated so much heat that Baird couldn't use a human for the testing, so Stooky Bill was used. The exaggerated smiling black and white features of the dummy's face were necessary for the early trials. Eventually the hair became singed and the painted face became cracked by the heat.