A highway on which every single mile is marked by a small green sign, showing the mile number.
Of course, we have the same “problem” with the Rolex Daytona and the Omega Speedmaster (and all the other chronographs that use a fixed tachymeter bezel).Let’s say, for example, that you are driving from Atlanta, Georgia to Birmingham, Alabama, along Interstate 20. This Carrera is a good tool for computing your average speed over one measured mile, but what if you want to keep driving, and determine the speed over a second (or third or fourth) measured mile? It’s just that the scale is fixed on the dial, rather than being fixed on the bezel.Whether on the bezel or on the dial, starting with the chronograph second hand in the 0 position, we can use the chronograph to time one measured mile (or kilometer), and the tachymeter track will show us the MPH (or KPH) for that mile.The Challenge - Computing Average Speed per Mile (MPH) Over Consecutive (Sequential) Miles.To study the Carrera shown above will also illustrate the limitations of the fixed tachymeter bezel. We have covered one mile, and used the tachymeter bezel to compute our speed over this mile.Notice that that a tachymeter scale printed on the dial of a chronograph is the functional equivalent of a tachymeter scale printed on a bezel. (i.e., 22-3/5 seconds for one mile means that he would have covered 160 miles in one hour). For a refresher on the basic use of a Tachymeter bezel, have a look.īy a direct reading on the tachymeter bezel (i.e., seeing where the chronograph second hand falls on the tachymeter bezel), we determine that the driver covered that mile at a rate of approximately 160 miles per hour. The basic math incorporated into the tachymeter scale is simple: Divide 3,600 (the number of seconds in one hour) by the number of seconds that it takes to cover one mile, and you will see your average speed, expressed in MPH. If the chronograph itself measures the time that it takes to cover a known distance (for example, the seconds that it takes to cover one mile or one kilometer), the tachymeter bezel provides a direct reading of the average speed that was achieved over that distance (most commonly, miles per hour (MPH) or kilometers per hour). I will try to keep my answers relatively simple if readers would like to “drill down” to discuss some of the nuances, we can do so in additional postings.The Purpose (and Mathematical Basis) of the Tachymeter BezelI will assume that our readers understand the basic purpose of a tachymeter scale (as incorporated into a chronograph) – to determine the speed of an object traveling a fixed distance. It becomes far more difficult when we consider the use of a rotating tachymeter bezel.
So what is this ‘tachymeter’ for? And, if it has a use, are you actually using it or is it just a ‘design thing’ that you don’t mind?”The question, “What use is a tachymeter?” appears to be simple enough, but the answer is complex.
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