15 August 2013
Updated at 20:22 ET
The mystery of the vanishing gun inventor
Picture believed to be of William Cantelo
A photograph passed down through Cantelo's family and believed to be of him
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William Cantelo, a 19th Century inventor rumoured to be working on an early version of the machine-gun, left his house one day and never returned. What happened to him, asks Steve Punt
link-
http://www.bbc.co.uk/news/magazine-23709471