How To Use a Tachymeter

What is Chronograph? What is Tachymeter?

A chronograph is a timepiece or watch with both timekeeping and stopwatch functions.
A tachymeter or known as tacheometer is a kind of theodolite used for rapid measurements and determines the distance to target, and is highly automated in its operations.
Using the Tacho-productometer (TPM) scale
1, 10, 100 or 1,000 etc. units (such as Km – kilometre) are indicated by the seconds hand. When stopped the seconds hand points to the figure on the TPM scale by which the number of units (1, 10, 1,000 etc.) must be multiplied to obtain production rate or per-hour speed.

Examples:

• A racing car covers one kilometre in 30 seconds.
The seconds hand stopped upon completion of the mile at the 120 mark on the TPM. Average speed of the car = 120 X 1, or, 120 km per hour.

• A bicycle covers one kilometre in 45 seconds.
The seconds hand stopped upon completion of the mile at the 80 mark on the TPM.
Average speed of the car = 80 X 1, or, 80 km per hour.