Seaham Colliery; County Durham; England; showing the head gear above the shaft; and work in an active coal seam. The central vignettes show two models of miner's lamp; the Davy; left; which was the more popular; and the Clanny. Below; a boy is operating the ventillating furnace which created a draught in the workings; so preventing a build up of fire-damp (methane). On the right a pit pony pulling wagons has just passed through a trap door; another device to control ventillation. Engraving from The Graphic (London; 28 January 1871).