GRAVITY BALLS Tell EXACT TIME (Nov, 1931)
GRAVITY BALLS Tell EXACT TIME
A CLOCK without hands, which tells the exact time by the rolling down hill of steel balls, has been perfected by a Philadelphia inventor. It required twenty years to discover the secret of accuracy in rolling the balk mile after mile, but on a recent three months’ test run the clock showed a gain of only a few minutes.
The steel balls are automatically released at the top and travel in relays to the bottom on track made by two fine music wires. The mechanism starts a new ball every 2-1/2 minutes. When a ball reaches the 60 mark it enters a trip cage which lowers it onto the hour beam. When 60 balls have descended to the beam it tilts and turns indicator to next hour. The device is especially adaptable to window advertising displays.