1.   As the testing machine pushed down on the load cell, the stylus pressed against the paper ballot.

2.   Next the grapefruits are weighed, one by one, by electronic load cells as they pass by.

3.   The strain gauge was fastened to the underside of the load cell, which in turn was attached to the low-capacity testing machine.

4.   They attached the stylus to a load cell, a strip of aluminum about the size of a ruler.