This timepiece is dominated by a prominent pulsation scale around its outer perimeter that allows the wearer to easily calculate a patient’s pulse. It’s quite simple wait for the second hand to pass one of three “Start” fields on the dial. Then simply count the first fifteen heartbeats and then stop, look at the dial, and note where the second hand has fallen on the pulsation scale. The number indicated at the seconds hand is the patient’s heart rate in beats per minute.
CREDIT: Archimede-Watches.com