Dan Henry 1972 Chrono Alarm
Your Dan Henry 1972 is equipped with the Miyota 0S80 movement with a 12-hour 1/10th second chronograph, alarm, and tachymeter scale.
Setting the time:
1.1. Unscrew the crown.
1.2. Pull out the crown to the second click position.*.
1.3. Turn the crown to set the hour and minute hand.
1.4. Push in the crown to the normal position.
* If the crown is pulled to the second position while the chronograph is started, the chronograph hands will continue to move. This is not a malfunction.
Lock or unlock the second hand:
The second hand for normal timekeeping is in the sub-dial in the 6 o’clock position. If you want to lock the second hand, press the right lower pusher, which will stop the seconds hand. Stopping the second hand will not affect the timekeeping.
Setting the date:
3.1. Pull out the crown to the first click position.
3.2. Turn the crown counterclockwise to set the date.
Do not change the date when the hands are set between 9 PM and 3 AM, because the date may not change properly. To set the date during that time, first change the hands to any time outside of that range; then set the date and then reset the correct time. 2.3. Push in the crown to the normal position.
3.3. Push in the crown to the normal position.
3.4. Screw in the crown to keep your watch safe from water.
Using the alarm:
The alarm hand is the large central hand with a triangle in the point. The alarm will sound when the hour hand aligns with the alarm hand.
4.1. Pull out the crown to the first click position.
4.2. Turn the crown clockwise to set the alarm.
4.3. Pull the left button to turn on the alarm, the on/off indicator will point to “I”, by pushing the left button the alarm will turn off and the on/off hand will point to “0”.
Using the chronograph
Your Dan Henry 1972 alarm chronograph features a stopwatch that can measure up to 12 hours.
The large central seconds hand count the seconds, the subdial at 12 o’clock shows the minutes, the subdial at 9 o’clock counts the hours, and the sub-dial at 6 o‘clock shows 1/10th-seconds.
To start the chronograph: press the top-right pusher. The chronograph hands will begin to move.
5.1. To stop the chronograph: press the top-right pusher again. The chronograph hands will stop and show the elapsed time.
5.2. To reset the chronograph: press button the lower pusher to reset the chronograph. All the chronograph hands will be reset to "0” position.
After 30 seconds, the 1/10th-second subdial will stop in the top position, but it is still calculating time inside the movement; by pressing the top pusher, the 1/10th-second subdial will show the accumulated decimals.
Using the tachymeter scale
The tachymeter scale can be used to compute a speed based on your time travelled. The tachymeter can also be used or measure distance based on speed.
To use the tachymeter for measuring speed: start the chronograph at the beginning of a 1-kilometer or 1-mile distance. At the end of the distance, the point on the scale next to the second hand shows your speed.
To measure distance: while traveling at a constant speed, start the chronograph at the beginning of the length to be measured. When the second-hand reaches the point on the tachymeter scale where the speed indicated equals the speed of the vehicle, one unit of distance (miles if speed is miles per hour, kilometers if kilometers per hour, etc.) has been covered.
For example, if you travel at a constant 80 mph (or at 80 km/h), then the distance traveled while the second-hand sweeps to "80" (45 seconds) will be exactly 1 mile at 80 mph (or 1 kilometer at 80 km/h).
How to reset the chronograph hands to zero