The Doctor's Date ACCUTRON is made so that reading can be started with the sweep second hand positioned at either the 4 or 10 o'clock positions. (See Pic below.)
At the edge of the dial are calibrated figures running from 110 to 60 starting on the 6 o'clock side and from 110 to 60 on the 12 o'clock side (see illustration). With the sweep- second hand positioned at either the 4 or 10 o'clock position, count the patient's pulse until 20 beats. At the end of the 20th count, the sweep-second hand will point to the patient's pulse rate on the pulse rate scale.
If you start with the second hand positioned at 4 o'clock and count 20 pulsations and the sweep-second hand has travelled to the 7 o'clock position, the pulse rate is 80 per minute.
If after counting 20 pulsations, the sweep second hand is at the 8 o'clock position, the pulse rate is 60 per minute.
Conversely, if you start with the sweep-second hand positioned at 10 o'clock and after counting 20 pulsations the sweep-second hand is at the 1 o'clock position, the pulse rate is 80, or if the sweep-second hand is at 2 o'clock, the pulse rate is 60 per minute.