Description of a Machine for Cutting Hard Sections. 



By J. Matthews, M.D., F.R.M.S. 



ExhiUfed Sept. 26th, 1879. 

 Plate IY. 



This machine is shown in Plate IV., Fig. 1 being a plan view, 

 and Fig. 2 a side elevation. 



The apparatus, it will be seen, consists of a metal stage plate 

 A, supported upon four pillars or legs B B, and is mounted upon 

 a base board C. On the upper side of the stage A are four 

 vertical pivots d, upon which are fitted, so as to turn freely 

 thereon, the four flanged rollers D D and D^ D^. In front 

 of the rollers D is fitted a flat metal plate E, and at the back 

 of the rollers D^ is similarly fitted a flat strip of wood F, the 

 side of the strip bearing against the rollers being provided with a 

 lining of india-rubber. 



The plate E and the strip F are secured together by means of the 

 transverse tie bolt G and the clamp H, thus forming a kind of rect- 

 angular frame, capable of traversing freely to and fro on the rollers 

 D and J)\ 



At the end of the stage plate A is mounted in suitable bearings 

 a crank-shaft I, fitted with a fly-wheel I* and a winch handle J. 

 This crank is connected by the rod K to the bolt G of the rectan- 

 gular frame E F. 



In front of the plate E are secured the metal bars L and L^. The 

 bar L is slotted, and is secured by two screws, so as to be capable 

 of adjustment vertically by means of the screw /. The bar L^ is 

 pivoted to the plate by one screw, so as to admit of adjustment 

 laterally by means of the screw l^. A fine saw web m is clamped 

 by its ends to the two bars L L^. It will now be understood that 

 the saw being clamped in its place, the requisite tension can be 

 given to it by the screw l^, while, by means of the adjusting screw /, 

 its parallelism can be secured. On turning the crank-shaft I by 

 means of the winch handle J, a reciprocating motion will be im- 

 parted to the frame E F and to the saw ?n. For holding and 



