TACHYMETER
(for models with tachymeter scale)
To measure the hourly average speed of a vehicle
English
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U s e t h e s t o p w a t c h t o d e t e r m i n e h o w m a n y seconds it takes to go 1 km or 1 mile.
Tachymeter scale indicated by STOPWATCH second hand gives the average speed per hour.
Ex. 1 |
| 60 | TACH | ETER |
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| 65 |
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| YM |
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| 5 |
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| 0 |
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STOPWATCH | 75 |
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| 0 |
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second hand: |
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| 0 |
0 |
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40 seconds |
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8 |
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| 0 | 8 | 1 |
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Tachymeter scale: |
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| 1 |
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| 6 |
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“90” | 0 |
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| 1 |
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0 |
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| 021 |
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“90” (tachymeter scale figure) x 1 (km or mile) = 90 km/h or mph
*Tachymeter scale can be used only when the time required is less than 60 seconds.
Ex. 2: If the measuring distance is extended to 2 km or miles or shortened to 0.5 km or miles and STOPWATCH second hand indicates “90” on tachymeter scale:
“90” (tachymeter scale figure) x 2 (km or mile) = 180 km/h or mph “90” (tachymeter scale figure) x 0.5 (km or mile) = 45 km/h or mph
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