Safety lamp it. Air is drawn in and descends just inside the glass, passing up through the flame in the centre of the lamp. The outer casings of lamps have been made of brass or tinned steel. If a lamp bangs against a hard piece of rock a spark could be generated if iron or untinned steel were employed. Within months of Clanny's demonstration of his first lamp, two improved designs had been announced: one by George Stephenson, which later became the Geordie lamp, and the Davy lamp, invented by Sir Humphry Davy. Subsequently, Clanny incorporated aspects of both lamps and produced
S. Isadore Miner S. Isadore Miner S. Isadore Miner (September 25, 1863 – August 10, 1916), also known by the pen name Pauline Periwinkle, was an American journalist, poet, teacher, and feminist. She served as the first corresponding secretary of the Michigan Woman's Press Association and was a staff member of "Good Health", Battle Creek, Michigan. Using the pen name of "Pauline Periwinkle", Miner was the founder and editor of the "Woman's Century" page of "The Dallas Morning News". She was "one of the most widely-read columnists in the early twentieth century." Sara Isadore Sutherland was born in the township of Battle Creek,