62 Transactions of the American Institute. 



is driven to and fro by cranks. The block of stone is inclosed in a 

 framework or cage, and is raised toward the saws by massive screws, 

 driven by an automatic adjustable feed. The carbons or black dia- 

 monds, forming the cutters, are firmly set in steel blocks, two or more 

 of which are inserted in the saw blades, so that at each stroke one 

 block of diamonds is withdrawn from the end of the stone. An 

 ingenious arrangement of guides keeps the saw blades in position. 

 The diamonds are arranged to cut only in one direction, as the slides 

 upon which the sash rests are automatically raised by cams on the 

 return stroke of the saws, so that the diamonds are relieved from the 

 to and fro thrust, which might tend to loosen them. Water is kept 

 constantly supplied to the diamonds, so that they are kept cool, and 

 the cuttings of stone are washed from the kerf. This machine cuts 

 stone, marble, etc., about twelve times faster than the same work can 

 be done by the system generally in use, and thus effects a great 

 economy in this important branch of industry. We deem the changes 

 and modifications embraced in this invention of such importance as to 

 entitle it to the highest commendation of the Institute. 



JOHN MATTHEWS. 



EDWARD A. RAYMOND. 



M. A. SUTHERLAND. 



THE GOODYEAR BOOT AND SHOE SEWING MACHINE 

 CO.'S BOOT AND SHOE SEWING MACHINE. 



T'O'the Board of Managers: 



Gentlemen. — After a full and impartial examination of the above 

 named machine, the undersigned judges make report that this novel, 

 ingenious and eminently practical machine is designed particularly for 

 sewing what are known as turned shoes ; it is also adapted for sewing 

 welts or inseams. 



Prior to the invention and construction of this machine, work 

 of this character was generally performed by hand. Machines are in 

 use in which the upper is sewed to the sole by stitching directly 

 through the sole of the shoe, in which case an insole is necessary, to 

 which the upper is first secured by nails, and the shoe is then removed 

 from the last before sewing it in the machine. 



This machine consists essentially of a large upright column sustain- 

 ing the working parts. A last-holder or jack, being a long lever so 

 constructed as to sustain the shoe and to permit it to be turned as may 



