Robinson Manby Johnson (1849-1894) was born in Kensington, London, the son of Henry Johnson, a Dronfield file manufacturer, and his wife Isabella. The family had interests in local coal mines: Henry’s brother-in-law was George Lucas, a coal master, while Isabella in the Census (1851) described herself as a ‘proprietor of land and coal mines’. By 1871, Robert M. Johnson had joined Frederic Lucas (probably George’s son) to form Lucas & Johnson, Britannia metal and electro-plate manufactu....