818 



DIGGING AND PREPARATION OF PEAT. 



revolving knives. The peat is thus finely subdivided, uni- 

 formly mixed together, and finally issues through the orifice b 



Fig. 398. Grotjahn's machine. 



Fig. 399. Cutting cylinder of Grotjahn's machine. 



(Fig. 399), on to a plank d c, which is pushed forward on rollers. 

 A workman stands at the orifice of the machine and cuts the 



