Mechanical Hound: The mechanical hound exists in the original book but not in the 1966 film. It is an emotionless, eight-legged killing machine that can be programmed to seek out and destroy free thinkers, hunting them down by scent. It can remember as many as 10,000 scents at a time. It has a proboscis in a sheath on its snout, which injects lethal amounts of procaine and morphine. Although Montag is able to survive a partial injection into his leg, he suffers severe discomfort and numbness for a short time. The first hound encountered in the novel is destroyed when Montag sets it on fire with a flamethrower. A second hound is sent to kill Montag but loses his scent when Montag jumped into a river. The hound then goes and finds a random victim to convince the television audience that the hound never fails. Bradbury notes in his afterword that the hound is "my robot clone of A. Conan Doyle's great Baskerville beast", referring to the famous Sherlock Holmes mystery The Hound of the Baskervilles. Lives in the firehouse.
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