Why a toaster from 1949 is still smarter than any sold today – The Verge

With the Sunbeam, the heat radiating from the bread itself warms up a bimetal strip (one of the simplest kinds of thermostats) which, being made of two different kinds of metal that expand at different rates, ends up bending backwards to sever the connection and stop the flow of electricity when the toast is done. …

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