Chronograph in addition to travel time, but also a separate record of the time spent on something, the surface has recorded a small needle dial at different times, chronograph was invented in 1720 by the British George Graham. Scale Chronograph with 30 minutes or 12 hours of timing. The second hand of the nominal center, usually stopped at zero status. Chronograph most common scale system, usually located in the outermost dial or watch case on the outer ring. The main principle is: Known to a unit distance, for example: 1 km or 1 mile, when a moving object within the distance of the beginning of activity, start chronograph start function, when the unit distance and then press the end button , The speed of this object is the scale guided by the pointer. If the scale system for the single lap design, the object speed of less than 60 kilometers per hour, the code table to take effect; scale spiral design of the code table will not meet the normal stopwatch function watch outer ring engraved with 500/400/350, etc. The reduced numbers, which represent the physical quantities for the speed in kilometers per hour; this bezel is called TACHYMETER. Such as a car at a fixed speed of one kilometer or a mile. To measure the speed method, for example, Breitling, when the car to the roadside milepost benchmark for progress, began to activate the timer, when the car reached the next milepost mark, the timer stops, the timer pointer stays in the speedometer The position on the scale is equal to the car's speed, such as the application of 1,000 meters 45 seconds, Tissot, you can convert the speed of 80 kilometers per hour. Whether it is mechanical watches, quartz watches, and even LCD display digital table, there are chronograph products. LCD digital watch is the lowest of the three, but the timing function is the most accurate, accuracy of up to one hundredth of a second or one thousandth of a second. Quartz chronograph expensive, most of the accuracy of one tenth of a second. The accuracy of the mechanical chronograph is the worst, only in seconds, but the movement of the complex structure, so the price is the most expensive.
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