Alcard of Medalsy Sfc, at Kilburn. ~i\ 
Fig. 16. — Disc of the Convertible Machine. ' 
Another important point is, that the roots are held much steadier during the 
operation, because the cut is commenced on both sides at once, tlie roots being 
chitched on opposite sides at the first contact, and finnly held until the ■whole- 
cut is taken. 
Fig. 15 (p. 722) shows a bar of knives detached. This can be readily done 
by an unskilled labourer in a few minutes. 
Fig. 16 shows the disc of the convertible machine. It also shows the method 
of removing the half-discs and replacing them by pulping discs when required. 
To attach the slicer knives the cutting discs remain, but the bars of knives 
are removed, the slicer knives taking their places. The half-discs arc secured 
VOL. XV. — s. s. 3 c 
