Who deserves credit for inventing the miners' safety lamp: Humphry Davy, honored by the Royal Society in 1815, or George Stephenson, who devised his own lamp independently the same year?

A local committee of enquiry gathered in support of Stephenson exonerated him, showing that he had been working separately to create the Geordie lamp, and raised a subscription for him of £1,000. Davy and his supporters refused to accept their findings, and would not see how an uneducated man such as Stephenson could come up with the solution he had: Stephenson himself freely admitted that he had arrived at a practical solution on the basis of an erroneous theory. In 1833, a House of Commons committee found that Stephenson had equal claim to having invented the safety lamp. Davy went to his grave claiming that Stephenson had stolen his idea.