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much higher than the ordinary hand chisel. A good machine, 

 and works well. Entitled to the highest merit. 



[Jl gold medal awarded. 

 JYo. 496. — Slate Dressing Machine. 

 New England Mining and Quarrying Company, Brattleboro', Vt. 

 A new invention, and useful. Much in use. 



J\^o. 957. — Expansio7i Bolt and Screw Fastener^ 

 Lowdon & Ahlstrom, 276 Bowery. An original and exceedingly 

 useful invention. [Jl gold medal awarded. 



JVo. 1119 — Six Rotating Cutting Machines for Metals. 

 Cutting Machine Manufecturing Co , Boston, Mass., the inven- 

 tion of S. P. iiuggles. They are divided into two classes, viz : 



Class First — Embraces all sizes cutting over 3-16 inch thick, 

 and in which the blades are not allowed to come nearer together 

 than about one-half the thickness of the sheet to be cut. 



Class Second — Includes all" sizes for cutting 3-16 inch thick 

 or less, and on these the blades lap or pass each other in cutting. 

 Some of the superiorities these shears possess over all others 

 ever used, are: They cut sheets of any length or thickness at 

 one stroke. They cut j^erfectly straight at all times, without in 

 the slightest degree drawing the sheet towards or crowding it 

 from the blades. They leave, when the blades lap, as smooth 

 and finished an edge as the finest finish could produce; and when 

 the blades do not lap, as smooth an edge as the work of that 

 thickness of plate ever requires; and in all cases the sheet is 

 perfectly free from w^arp or twist. The upper blade being a ro- 

 tary circular blade, they cut both ways, thereby saving fifty per 

 cent, of time and labor over other shears, as, while with others 

 the upper blade would be raising to get the stroke down, these 

 would be cutting. They are self- sharpening. They have conve- 

 niences attached to them for cutting squares, angles, or strips, of 

 any dimensions, without scribing the sheet, which are arranged or 

 altered instantly. Tiiey require the least power of any shears in 

 use, the tliickest boiler plate being cut with ease, by hand. A three 

 inch belt, twenty inch pulley, is all that is required for driving 

 them in cutting 3-4 inch plates, ten feet long. They can cut boiler 

 plates, with a bevel edge, thereby saving the expense and labor 

 of chipping, as now done with the cold cliisel and hammer, turn- 

 ing out the plate ready for riveting and caulking. All the 

 different sizes can be made to operate by power or hand. These 

 machines are well finished, and w^ell adapted to the purposes in- 

 tended. [^5 gold medal awarded. 



