North, M.A., 1964. THE FIRE HAZARD OF ELECTRIC BLANKET ELEMENTS ON BREAKING. Fire Research Notes 569
Experiments have been performed to compare the fire hazard of various types of electric blanket element on breaking. The elements, which were carrying current, were bent regularly until they broke, the number of cycles required to break them and their behavior on breaking being noted. The number of cycles has been related to the design of the element, except for a few unusually long-lasting types. Those elements constructed with a single heating wire appear to be less of a fire hazard than those with multiple wires.