AMERICAN INSTITUTE. 129 



Ly Sander Wright, 230 Market street, Newark, N. J. 



The points of superiority claimed in Wright's Patent Scroll Saw 

 are : 



1. The manner of connecting the saws with the machine. Tliis 

 is simply done by slipping one end of the saw through the table, 

 and hitching it on to the cross-head at the top of the pitman, and 

 hitching the other end to the bottom of the cross-head, in the slides 

 above the table. A great deal of time is saved by this arrange- 

 ment, especially in sawing open work, for the saw is instantly 

 changed from one place to another. 



2. The mode of straining the saw by a spring above, is worthy 

 of particular note. This gives a clear table for sawing work of 

 any length. 



3. The saw and spring being attached to different sizes of pul- 

 leys, the saw to the large one in the centre, and the spring to the 

 smaller ones on each side, permits the saw to have all the stroke 

 required, while the spring only moves about one-third the dis- 

 tance. On this account the spring may have any degree of strength 

 necessary, and vibrate much more rapidly than it could be made 

 to do, if it was required to traverse the whole distance the saw 

 moves. Again, the slight motion of the spring saves the treml^ling 

 of the building, which is so unpleasant where other saws are in 

 use. 



4. The simplicity and compactness of the head, is a valuable 

 peculiarity. It embraces the foot, raised or lowered by tlie gear- 

 ing at the top, for holding different thickness of stuif j the revolving 

 guide block, with slots in the outer edge, in which the saws of any 

 width are held steady while in operation; the slide, hung on a 

 pivot at the upper end of the shoe, and held by a set screw near 

 the bottom, in which slide the cross-head, to which the saw is 

 attached, is made to move. If the bottom of the slide is thrown 

 forward, the saw, in passing down the plane, strikes ahead; thus, 

 for sawing fast, any desirable amount of rake is given to the saw. 

 The whole head may be raised or lowered for saws of any length, 

 by loosening a set screw in the back of the post. 



5. The saws are not liable to be broken by the pin in either 

 end giving way; for if the upper pin fails, the saw drops through 



[Am. Inst.] 9 



