Timing to 1/5 second.

Timing up to 30 minutes.

Production counting scale (U)

The production-counting scale is especially useful to large-scale manufacturers, as it enables them to determine the number of articles produced per hour. 

The production-counting scale U on the dial of this model shows the production rate per hour; no calculation is necessary if the basis of observation (the time taken to manufacture a single article for instance) does not exceed 60 seconds. The observer releases the chronograph hand at the beginning of the observation and stops it when the observation is completed; the figure shown by the hand on the scale represents the number of articles produced per hour. 

If the time of manufacture is very short (up to 5 seconds, for instance), it is necessary to take as the basis of observation the time taken in manufacturing several pieces. The product of the number of pieces taken as the basis and the number shown on the scale represents the production rate per hour. 

The chronograph dial on the opposite page shows the sweep hand pointing to 770 after the production of one piece. This would be the number of pieces produced per hour. If 5 pieces were produced during the same time, the production per hour would be 5 times 770, or 3,850 pieces. 

It is, of course, possible to observe production times exceeding 60 seconds; the quotient obtained by dividing 1 hour (3,600 seconds) by the number of manufacture taken as the basis represents the production rate per hour.

U = Production counting scale