INDUSTRIAL LABOUR 



435 



and empty) of 30 kilometres represents about the. best attainable 

 result. 



Fig. 295. A youth drawing a light load. 



With a two- wheeled barrow the load can vary from 100 to 500 

 kg. In this case, however, we should introduce a number of 

 periods of rest.- 



All two-wheeled hand-carts fall into the same category as the 

 two-wheeled barrow, although they are generally pulled and not 



Fig. 296. Instantaneous photograph shewing flexion of the knees. 



