kettle (finally solved)

In 1922, the problem was finally solved by Leslie Large, an engineer working at Bulpitt & Sons of Birmingham who designed an element of wire wound around a core and sheathed in a metal tube. As this element could be immersed directly into the water it made the new electric kettle much more efficient than stovetop kettles. In 1955, the newly founded British company Russell Hobbs brought out its stainless steel K1 model as the first fully automatic kettle. A thermostat, triggered by the rising steam as the water would come to boil, would flex, thereby cutting off the current.