186 FELLING AND CONVERSION OF TIMBER. 



when short. The width of the blade varies considerably. 

 Fig. 100 represents the broad blade of the Bohemian bow-saw. 

 The bow is made of a sapling of spruce, rowan or hazel, also 

 of elm and ash ; recently it has been made of metal, with 

 tension screws. It is much used in North Germany, also in 



Fig. 101. Tyrolese curved saw. 



Bohemia, Moravia and Kussia, but is not known in South 

 Germany. 



The Tyrolese curved cross-cut saw is constructed as shown 

 in Fig. 101, and the dog teeth are often made longer in the 

 middle than at the two ends, where they are less in use. 



Fig. 102. Thuringian curved saw. 



These curved saws vary in length and curvature, and are 

 either straight or slightly curved inwards at the back ; they 

 are extensively used. 



The Thuringian, or Saxon saw (Fig. 102) may be taken as 

 the type of a saw in which not only the edge, but also the back 

 of the blade, is curved. It is a very light and short saw, but 

 is strong ;md turns out good work. It is not suitable for very 

 broad cuts, as when made long it is not stiff enough. In 

 spite of this defect, it has, however, recently been introduced 

 into several districts in the Black Forest. 



K. Gayer and East* have tested the work done by cross-cut 



* Gayer u. K:ist. " I'.ritrsi^ xur Knnil tiling dcr Leistungsfahigkeit ih'r 

 ,'' in I'.aurs I'urst wi.^rnsrii. /entralbl., 1 S%, pp. 11 7 17S. 



