The eight-foot sandstone Davy lamp was created in recognition of those who died at Bilsthorpe pit between 1927 and 1997.

BBC: Memorial unveiled to miners who died at Bilsthorpe pit

Working together, the two developed the Davy Lamp for miners.

ECONOMIST: Science

The Davy safety lamp on which the sculpture is modelled was devised in 1815 by Sir Humphry Davy after a group of Newcastle miners told him of the dangers they faced from methane gas.

BBC: Memorial unveiled to miners who died at Bilsthorpe pit