Watch speed is the outer ring of the watch engraved with 500/400/350, etc., in order to reduce the number of chronograph, the physical representation of these speed, in kilometers / hour; this bezel called the tachometer. How to use Take a vehicle traveling on an expressway as an example, because the expressway usually has a distance indicator rod standing on it; the stopwatch is started when passing through the starting point, the stopwatch needle starts counting at 12 o'clock, and when it moves for 1 km, the counting stops; at this moment The number referred to by the needle is the average speed of the previous kilometer. For example, at 12 o'clock there are 60, because a minute walk 1 km, then the speed is 60 km / h. Bezel on the number corresponding to the location is how to figure out it? it's actually really easy. To know that 500 this number should be engraved in that position? Then you need to do a simple division; that is, how much time it takes to calculate 1 km at 500 km / h, in seconds. 1 hour = 3600 seconds, then 500 kilometers need 3600 seconds to complete, according to the principle of equality, the time required for 1 km is 3600/500 = 7.2 seconds, so 500 must be engraved in the dial at 7.2 seconds. Similarly, 400 should be engraved in 3600/400 = 9 seconds, while 100 is engraved in 36 seconds. At speeds of less than 60 km / h, the tachometer can not be used directly unless a low speed scale is added.
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