420 



THE HUMAN MOTOR 



polated therewith. Assuming the work per hour to be 8,800 kgm. 

 the work per day is : 



8,800 X 7 = 61,600 kilogrammetres. 

 The weight of metal removed would be : 



82 X 7 = 574 grammes, 

 and the approximate expenditure of energy : 



61,600 X -023 = 1417 Calories. 



317. The Work of the Apprentice. The foregoing calculations 

 have dealt with the work of the skilled mechanic. When we 

 consider the work of an apprentice (fig. 279) we find that the 

 mechanical and physiological conditions are less satisfactory. 



Pressure *o/rfie two hands 



fert/ccr/ component of left hand 



Horizon fa/ component of /eft hand 



fforrzo/tfa/ component of right h 



fiesjD/rar/ons 



7/me in seconds. 



FIG. '288. 

 Graphical record of efforts and respirations of an apprentice. 



