308 Mr. CuJtartcSs Cutting Engine. 



fit againft the front edge of the rule G G. Thfc rule I\ 

 which is moveable with the knife r r, is tapered from the end 

 H, fo as to be fomewhat narrower at the end next to the ca- 

 vity D, than the diameter of the pieces of wood that can be 

 contained betwixt theholdfaft (c, fig. 3.) and the other fide of 

 the locket. From this the wonderful fimplicity and accuracy 

 of the procefs, as performed by this apparatus, mud be ob- 

 vious ; for the focket, or in other words the piece of wood 

 from which the flip is to be cut, being railed to the defired 

 height by turning the micrometer 0, all that is neceffary is 

 to Hide the rule H, with an even hand and prefiure, along 

 between the rule G G and the wood to be cut ; the taper 

 form of the knife, or rather of its bed, caufing it to (have 

 off, as the broad end comes nearer to the focket, a flip from 

 the furfacc expofed to its action. It mould be here remarked, 

 that a portion of the bed (the rule H) is cut away from 

 under the knife, from r tor, to allow the knife to pafs freely 

 over the wood as it performs its office. To keep the wood 

 perfectly fall in its place while the flip is cutting off, befides 

 the holdfaft in the focket already defcribed, there is the fol- 

 lowing contrivance : — A brafs fpur, u, a little thinner than the 

 rule H, having a circular notch at its widcfl end, which may 

 be moved or made faft at pleafure by means of the fcrew v, 

 is brought up tight againft the wood to be cut (the wood 

 bein«- embraced bv the circular notch"}, and then fcrewed 

 faft ; the opening at the narrow end of the fpur, through 

 .which the fcrew paffes, Is in the form of a flit, to allow it to 

 be adapted with eafe to different fizes. 



As the brafs focket rifes as well as the wood, (and this is 

 iodifpeniible to fecure the parallel riling of the wood after each 

 cut,) it muft be obvious, that when, by being railed to allow 

 taking off repeated cuttings, it has been brought almoft to 

 the knife, the apparatus muft be re-adjufted, and the. wood 

 raifed in the focket before move cuttings be taken off. 



It need hardly be remarked, that the cutting knife u 



ground 



