Timex Watch (T2P277) T2P277 Scheda Tecnica

4.  The chronograph second hand is compared to the 

tachymeter markings to determine the target’s speed.

The slide rule function of the top ring operates by rotating 

the outer ring. The inner ring does not move. The outer 

ring is always related to “distance” or “speed”, or any 

data that varies with time. The inner ring only notes units 

of time.
outer ring 

On the outer ring, the figure “10” represents factors or 

multiples of 10, such as 0.1, 1.0, 10, or 100
Inner ring 

On the inner ring, “MPH” (mile per hour) refers to “speed 

index”. This index is used to calculate the speed involving 

any data per hour. On the inner ring, “STAT” (statute 

miles) and “NAUT” (nautical miles) are for conversion of 

distance units.

outer ring

inner ring