112 



THE SAWMILL 



The saw frame has an oscillating motion which presents the saw to the cut in an easy raking sweep, 

 forcing each tooth to do its full share of the work. 



Gang saws are either fed from a carriage (Germany) or the logs are run through feed rolls, feeding 

 the logs into the saws. 



Blades are 6 to 10 inches wide, and of 8 to 16 gauge. 



Horse-power required is, for friction 3 horse-power; for first blade 4 horse-power, and for every 

 additional blade '2 horse- power more. 



Where log heaps (up to 12 logs) are run through the gang saw, the logs are slabbed by a "rosser" 

 or "log siding machine," so that the logs can be placed one upon another. 



The logs are not turned, and all boards obtained lie parallel in the log. 



Miniature of a lieavy gang- 

 saw, with trucks, made by 

 Schmaltz, Offenbach, Germ. 



Double circular saw removing two slabs simultaneously, 

 made by Schmaltz, Offenbach, Germ. 



(c) Horizontal frame saw. It is used to cut fine veneers and valuable timber. Its advantage lies 

 in the fact that very little weight rests on the saw, that the saw may cut on both trips (to and fro), that 

 high speed may be applied and that a thin gauge can be used. 



The best makes are Kirschner's, Leipzig, Germany, and Schmaltz', Offenbach, Germany. 



Horizontal straight saw at work, mill of W. Mahr, Darmstadt, Germ. 



Horizontal straight log saw, made by Schmaltz, 

 Offenbach, Germ. 



II. Circular saws. 



(a) Power. Generally speaking, the horse -power required equals Vs oi the diameter of the saw 



10 horse -power should manufacture 5,000 board feet per day 

 20 horse-power should manufacture 10,000 board feet per day 

 30 horse -power should manufacture 30,000 board feet per day 



