Here is another spine-tingling tale from the 1800 New Lights from the World of Darkness Or the Midnight Messenger; with Solemn Signals from the World of Spirits. Containing Wonderful Evidences of the Visits of Ghosts, Apparitions, &c. … and Notices of Death … The Whole Forming a Constellation of Horror!!!
Mine knockers, or Tommy knockers, (pronounced knacker) are said to be mischievious, but also benevolent, knocking the walls of a mine when danger is imminent.
