|8 years,||Errands. Light work. Makes beds.||Low||Moron.|
|9 years,||Heavier work. Scrubs, mends, lays bricks, cares for room with simple furniture.|
|10 years,||Good institution helpers. Routine work.||Middle|
|11 years,||Fairly complicated work with only occasional oversight.|
|12 years,||Uses machinery. Cares for animals. No supervision. Can not plan.||High|
Figs. 8 and 9. Ergograms. Records of a normal man and of a defective boy, the latter showing characteristic irregularities.
The ergograph was devised by Mosso, an Italian psychologist, and is used to measure muscular fatigue. A weight is lifted with one finger every alternate second until the muscle is tired out. Each lift is recorded on a vertical line and the sum total of lifts and lengths of lines are indicative of muscular action and voluntary control.