422 



THE HUMAN MOTOR 



APPRENTICE" X.P. BASTARD FILE ON 



Taking the average results given in the foregoing table, we have : 



11,222 X 6 = 67,322 kilogrammetres per diem. 



80-45 x 6 = 482-7 grammes of metal removed per diem. 



and the expenditure of energy is : 



482-7 x 4-87 == 2,356-75 Calories. 



In short, the work done per diem by the apprentice is about 

 15% less, and the corresponding expenditure of energy about 

 65% more than in the case of the skilled mechanic. 



It need hardly be remembered that conditions of activity, at 

 variance with scientific principles, are unfavourable both to the 

 well-being and output of the workman. 



318. Individual Variations. The experience gained as appren- 

 ticeship proceeds is evident in the inci easing output for the 

 same expenditure of energy. The numerous graphical records 

 which have been taken show that this is largely due to the 

 adoption of a suitable speed. 



These records, however, also show that even under definitely 

 determined conditions, personal variations are exhibited which 

 affect the results obtained. Thus the distribution of the efforts 

 of the two arms during the working stroke, varies considerably. 

 The writer was not able to make any experiments with left-handed 



