AMERICAN INSTITUTE. 91 



JYo. 1118. — Four Power Printing Presses. 

 S. P. Euggles' Power Press Manufacturing Company, Boston, 

 Mass.; J. Fursman agent, 12 and 14 Spruce street. For cards 

 and jobbing. A new combination, and an improvement on the 

 former plans of the same maimer. Fully worthy of a favorable 

 notice. [Ji silver inedal awarded. 



JYo. 1222.— Hand Sfarn^^. 

 American Machine Stamp Company, Boston, Mass.; Taulman & 

 Low, agents, 157 Broadway. For stamping letters, &c. Wor- 

 thy of a favorable notice. [^ diploma awarded. 



JVo. 328. — Stone Dressing Machine. 

 American Stone Dressing Machine Company, 62 William street. 

 This machine is designed for dressing stone for buildings, canal 

 locks, railroads, masonry, monuments, obelisks, and all kinds of 

 regular or rectilineal moulding. "The pillars sustain the chisels, 

 and also the revolving hammers, or the cylinder back of the 

 chisels, in which the cams are set in a spiral form. The stone 

 is placed upon a carriage, somewhat similar to the carriage of a 

 saw mill, and is driven forwards and backwards by a worm 

 w^orking in a rack underneath the carriage. The carriage with 

 the stone passes between the posts or pillars, and under the 

 chisels. The chisels are raised or lowered at pleasure, by means 

 of screws operated by gear and hand-wheels, aided by a counter- 

 balance underneath the bed of the machine, to suit the thickness 

 of the stone as well as the depth of chip required, and are pressed 

 back by the stone so as to come in contact with the cams, which 

 drive them forward with a sharp blow. The forward movement 

 of the stone presses the chisels back again, and the}' ai-e again 

 driven forward as before; this process goes on until the stone is 

 finished. The cams are set in a spiral form, and so arranged that 

 never more than two chisels act at one time, yet the blows follow 

 in such quick succession (each chisel, when the machine is under 

 full motion, receiving 1,800 blows per minute) that to the eye 

 of the spectator they all appear to work at the same time. In 

 this machine, with a gang of 16 chisels, over 28,000 blows are 

 given per minute. These machines are capable of dressing from 

 500 to 1000 feet of stone per day, according to the size of ma- 

 chine, doing the labor of from forty to eighty men. Eacli chisel 

 will perform a large amount more of service than it can possibly 

 do in tlie hands of the workman, as on account of the jorecision 

 with which the blows are given, we are enabled to temj)er them 



