OONVBRSION OF TIMBBB WITH THE BAW. 



Ill 



Fig. 56 exhibits several modes of sawing with the silver-grain. 



Fig. 56. 



A s 



Several methods of sawing with the Silver Oraiii. 



Methods A and B are practically the same, except that the latter 

 gives more broad planks, although at a slight sacrifice of quality in 

 respect of those taken from the outside of each section. In method 

 C there is less waste of wood than in either A or Ji, and the pieces 

 taken from the middle, where the silver grain is best exposed, can 

 be of specially large dimensions. In each quadrant the planks can 

 be taken off alternately one from each side, or alternately two and 

 two, or three and three, or irregularly if the log is strongly elliptic- 

 al. All three patterns, A, B, and C, possess this capital defect, 

 that the widths of the planks cut are very different. This defect 

 is, however, avoided in pattern D, In patterns A and B the wood 

 of the centre of the logs, which is always of doubtful quality, is 

 necessarily removed in squaring the inside edge of the planks. In 

 patterns C and D the centre of the log has to be specially cut out. 

 Besides that most of the methods of sawing with the silver grain 

 yield planks of very various widths, the width of the widest planks 

 is not even equal to the radius of the log. Hence, except for very 

 special purposes, it is not usual to saw with the silver grain, and it 



