|
-from a 1950 Omega Chronograph Catalog:
Using the Tacho-productometer (TPM) scale
1, 10, 100 or 1,000 etc. units (such as miles, pounds or objects) 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.
Example number 1:
To determine the production rate of a printing press.
Time required for the press to turn out 100 newspapers = 45 seconds.
The sweep hand was thus stopped at the 45 second mark.
This coincides with the figure 80 on the TPM scale.
Hourly rate of this press = 100 X 80 = 8,000 newspapers.
Example number 2:
A racing car covers one mile 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 miles per hour.
In the above examples we used decimal units (100 newspapers, 1 mile) solely
for the sake of simplicity. In practice, the Speedmaster's TPM scale can be used
to calculate velocities and production rates from any number of units.
Example number 3:
In 30 seconds a bottling machine fills 72 containers. Stopped at the 30-second
mark, the seconds hand now points at 120 on the TPM scale.
Hourly production of the machine = 120 X 72 or, 8,640 containers.
|