This device is used to calculate the salary of an employee based on an hourly rate.

The dials on both sides of the cylinder rotate a drum that is used to select an hourly rate between 15 and 52.5 (English units probably?)

We easily obtain the product of the hourly rate by the number of hours worked, which can vary from 1 to 100.

One can also calculate for every 5 minutes of work.

The unit is heavy and therefore made for use on a desk.