Vintage Cast Iron `Interval Timer`. Circa 1940`s. Working.

Originally used as an x-ray film timer.  To use, turn the knob on the front of the timer to the left to set the desired time, then pull down the arm on the side of the timer to start it. If needed, gently wind the timer up using the dial on the back - like any timer, be careful not to over-wind. The timer will start ticking and the short and long hands on the timer face will begin to move. The arm on the side of the timer moves back up into position as the time ticks off. When the time is up, a bell is sounded.  Great piece!

Size : 14 cm (including carry loop) x 11.5 cm x 5 cm.