For your consideration is a rare miner's hard hat with a Justrite carbide lamp. The hard hat is solid black and a hard leather that has some fading with age. The hat liner is intact and has an adjustable head band for snug fitting. This lamp was manufactured by the Justrite Manufacturing Company, in Chicago, Illinois during the 1930s. Acetylene gas is produced when water from the lamp's upper level encounters the calcium carbide stored in the base via a dripping mechanism. The amount of water flowing into the calcium carbide container can be controlled, with more water producing more gas and a bigger flame when the lamp is lit. This Justrite lamp features an Air Cooled Grip, with spacing between the rubber barrier and hot metal allowing the grip to stay cool. The lamp is marked "Made In USA" and is mounted to the hard hat. The mount indicates "SAFETY" "Pat'd Dec 1, 1925 No.1563931" This hat measures approximately 19 1/2" inside circumference.