Conversation so far:
What was Alexander Graham Bell's first experiment with sound?
Alexander Graham Bell's first experiment with sound was an automaton speaking head based off a machine by Baron Wolfgang von Kempelen and developed by Sir Charles Wheatstone.
How old was Alexander Graham Bell when he made the automaton speaking head?
Alexander Graham Bell was sixteen when he made his automaton speaking head.
What inspired Alexander Graham Bell to make the automaton speaking head?
Alexander Graham Bell was fascinated by an automated machine simulating human speech and his father encouraged him to build one through a promise of a prize.

Question: What year did they make the head?
Self-contained rewrite: What year did Alexander Graham Bell make the automaton speaking head?