<P> A safety coffin or security coffin is a coffin fitted with a mechanism to prevent premature burial or allow the occupant to signal that they have been buried alive . A large number of designs for safety coffins were patented during the 18th and 19th centuries and variations on the idea are still available today . </P> <P> The fear of being buried alive peaked during the cholera epidemics of the 18th and 19th centuries but accounts of live burial have been recorded even further back . When his tomb was reopened, the philosopher John Duns Scotus (1266--1308) was reportedly found outside his coffin with his hands torn and bloody after attempting to escape . The fears of being buried alive were heightened by reports of doctors and accounts in literature and the newspapers . As well as dealing with the subject in "The Fall of the House of Usher" and "The Cask of Amontillado", Edgar Allan Poe wrote "The Premature Burial", which was published in 1844 . It contained accounts of supposedly genuine cases of premature burial as well as detailing the narrator's own (perceived) interment while still alive . </P> <P> The general fear of premature burial led to the invention of many safety devices which could be incorporated into coffins . Most consisted of some type of device for communication to the outside world such as a cord attached to a bell that the interred person could ring should they revive after the burial . A safety coffin of this type appears in the 1979 film The First Great Train Robbery . Other variations on the bell included flags and pyrotechnics . Some designs included ladders, escape hatches, and even feeding tubes, but many forgot a method for providing air . </P> <P> Robert Robinson died in Manchester in 1791 . A movable glass pane was inserted in his coffin, and the mausoleum had a door for purposes of inspection by a watchman, who was to see if he breathed on the glass . He instructed his relatives to visit his grave periodically to check that he was still dead . </P>

Where does the saying saved by the bell