The miner’s safety lamp was designed by the mining engineering genius Sir Humphrey Davy, to withstand handling in arduous conditions. Sailors too have found their virtues invaluable: they are wind resistant, self-extinguishing if they fall, and have quarter-inch (5mm) glass. Though illumination is limited, it is an ideal night light on boats which must conserve battery power. Measures 9.5" ( 24cm ) tall.