2. Read the corresponding number on the outer tachymeter ring.
Let’s say the car covered one mile or one kilometer in 45 sec-
onds. The tachymeter number next to the 45-second mark is 80 –
so the car averaged 80 miles per hour, or 80 kilometers per hour,
over that measured course.
TO DETERMINE UNITS PER HOUR:
1. Start the stopwatch, count a convenient number of units and then
stop the watch. Say, for example, that you are counting units of
production and you stop the count at 10 units, and the sweep
seconds hand reads 45 seconds.
2. The tachymeter number next to the 45-second mark is 80. Multiply
10 times 80 to get the number of units produced per hour: 800.
NOTE:
The tachymeter numbers offer you a mathematical shortcut.
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TACHYMETER FEATURE
You use your tachymeter to measure rates of speed. Although it is
marked “kmh” for kilometers per hour your tachymeter can also be
used to measure “mph” or other units per hour.
It can calculate how many cars per hour pass a given point on the
highway, or how many units roll off a production line per hour.
Here’s how it works:
TO MEASURE SPEEDS OF TRAVEL:
1. Assume you wish to measure a car’s average speed over a one
mile course. Start the stopwatch when the car passes the starting
point. Stop it when the car passes the one-mile or one-kilometer
mark.
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