TACHYMETER
(for models with tachymeter scale)
To measure the hourly average speed of a vehicle
English
1
2
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 |
|
|
|
|
| |
| 65 |
|
|
|
|
|
| |||
|
|
| YM |
|
|
|
|
|
| |
|
|
|
|
|
| 5 |
|
|
|
|
|
|
|
|
|
| 0 |
|
|
|
|
| 0 |
|
|
|
| 0 |
|
|
|
|
|
|
|
|
| 4 |
|
| |||
| 7 |
|
|
|
|
| 0 |
|
| |
STOPWATCH | 75 |
|
|
|
|
|
| 0 |
|
|
|
|
|
|
|
|
| 0 | |||
|
|
|
|
|
|
|
| 3 | ||
second hand: |
|
|
|
|
|
|
|
|
| 0 |
0 |
|
|
|
|
|
|
|
| 2 | |
40 seconds |
|
|
|
|
|
|
|
| 5 | |
8 |
|
|
|
|
|
|
|
| 0 | |
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
| 2 |
|
|
|
|
|
|
|
|
|
| 0 |
|
|
|
|
|
|
|
|
|
| 0 |
| 0 |
|
|
|
|
|
| 0 | 8 | 1 |
| 9 |
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
| |
Tachymeter scale: |
|
|
|
|
| 0 |
| 1 |
|
|
|
|
|
|
|
| 6 |
|
|
| |
“90” | 0 |
|
|
| 1 |
|
|
|
| |
0 |
|
|
|
|
|
| ||||
| 1 |
| 4 |
|
|
|
|
| ||
|
|
|
| 0 |
|
|
|
|
|
|
|
| 021 |
|
|
|
|
|
|
|
|
“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
11
