The dial chronograph – Setting the hands correctly on a chronograph

Setting the hands correctly on a chronograph

After the chronograph is completely assembled and in working condition, replace the hour hand, minute hand, and second hand as you would on regular watch. At this point, do not replace the sweep second hand, the minute register hand or the hour register hand. Now push the button and bring the flyback lever in toward the center of the watch. When the flyback lever is held in toward the center of the watch, place sweep second hand at 60 on split second scale “C”. Place the minute register hand at 30 on minute register scale “D”. Place the hour register hand at 12 on the hour register scale “E”. After these hands are replaced, start chronograph mechanism with sweep second hand turning. Let chronograph mechanism run for at least 40 minutes; now push the button to bring the flyback lever in toward the center the watch again and check to see that the sweep second hand, the minute register hand, and the hour register hand go back to their original position.

The tachometer

1. The tachometer is used to indicate the speed of an object in miles per hour. A tachometer can only indicate the average speed of an object traveling over a course of a measured mile.

Method of using Tachometer

1. Start chronograph sweep second hand at the exact moment the object starts to travel the measured distance of one mile.
2. When the object has traveled the course of one mile, stop chronograph sweep second hand. The point on the tachometer scale where the sweep second hand stopped will indicate the average speed of the object in miles per hour.

Second Hand

1. The second hand indicates the passing of seconds and should move one space each second. One complete revolution of hand denotes passage of one minute. This hand is independent of chronograph mechanism and continues to register the seconds as long as watch is running.

Split Second Scale

1. This scale is divided into 300 divisions, each indicating 1/5 of a second. Every fifth division is marked with extra long lines denoting one second.

The main purpose of this scale is to measure a fraction of a second accurately.

Minute Register

1. The minute register hand indicates on the dial the number of minutes that have elapsed         since the beginning of the registration of the sweep second hand. One complete revolution of the minute register hand indicates the passage of 30 minutes; two revolutions, one hour.

Hours Register

1. The hour register hand indicates on the dial the number of hour that have elapsed since the beginning of the registration of the sweep second hand. Each division on the scale denotes ½ hour. Each number on scale denotes one hour. One complete revolution of hour register hand indicates 12 hours have elapsed. This hand will register the hours as long as the chronograph mechanism is in operation.