Bayard’s alarm-clocks in the 1950's
One of the first uses of radium was to make luminous the figures on the dials of clocks, alarm clocks and compasses. Traces of radium were added to a suspension of zinc sulfide, causing luminescence of the paint. In 1949, at the time of this advertising of the Bayard’s alarm-clocks, it was many years since radioprotection precautions were taken for the painting the dials.