years of the 20th Century, if you wanted to tell the time in the dark you had a choice: commission a or a repeater from a posh watchmaker like that nice M Bréguet. As the name suggests, you felt the time on the dial of a , whereas a repeater chimed the hours and minutes. Neither was cheap or easy to make. So once Marie and Pierre Curie isolated the glow-in-the-dark wonder-element radium, watchand clockmakers (car and aircraft instrument manufacturers, too)
