Bayard’s alarm-clocks in the 1950's |
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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. |
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