MECHANICS AND USEFUL ARTS. 77 



NEW METHOD OF MAKING SHOT. 



Ax apparatus for manufacturing shot by means of centrifugal action, 

 has been devised by M. Bonnet, of Xew York. It is intended as a 

 substitute for shot-towers, and other apparatus now employed for this 

 purpose. It consists in substance of the following parts : A circular 

 trough made of iron, is secured on a vertical shaft, which is made to 

 revolve. The upper part of the trough is of a funnel-shape, and there 

 is a pipe inserted in this funnel for conveying the molten lead into 

 the trough. The sides of the trough are perforated with a number of 

 small holes of different sizes. The metal being poured into the trough, 

 and the shaft made to revolve at the rate of 350 revolutions per min- 

 ute, the molten lead will fly from the centre to the circumference and 

 through the holes against a circular partition of cloth surrounding the 

 apparatus, at a suitable distance, which depends altogether on the 

 fluidity of the metal and rapidity of the motion. 



NEW PRINTING PRESS. 



THE Lowell Courier gives an account of a new Printing Press 

 recently invented by Mr. Reach of that city. Its main advantage 

 over other presses is said to be its cheapness ; and the following is a 

 brief description of its construction : " The method of operating dif- 

 ferent from the Adams press is that the nippers are rotary, being 

 carried round the platen by a chain geared upon pullies there being 

 two pairs, by which means impressions are given as fast as the rollers 

 are driven across the form one way one nipper taking in a sheet 

 while the other is carrying out the first on the opposite side. The 

 sheet, after being printed, is carried by the nipper over a fly and 

 thrown off, without any belting or bellows arrangement. The impres- 

 sions are given by the moving up of the bed of the press, operated by 

 the common toggle-joint, while the lever which drives up the toggle is 

 ' shipped ' from one pin or driver in the side of the main shaft gear, to 

 another on the opposite side. A stationary frisket keeps the sheet 

 from dropping upon the inking rollers. The nippers are simple clamp 

 fingers, operated by a spiral wire spring." 



An improvement in Printing Presses is also announced by Mr. Dins- 

 more, of Pennsylvania. The object of this invention is to make a 

 cheap press of a convenient form to be worked by hand, but capable 

 of doing a greater amount of work in a given time than the common 

 press. The printing is performed by passing the paper round a cylin- 

 der hung in a carriage, which is moved backwards and forwards along 

 a stationary frame or railway, upon which is fixed a type-bed which 

 carries the form, and at each end of which there is a feeding-board, 

 from which the sheets are supplied to the cylinder. The cylinder is 

 made to revolve by the movement of the carriage revolving in opposite 

 directions. It is furnished with two sets of fingers, which take a sheet 

 from each feeding-board, alternately, the cylinder carrying the sheet 



O v * > / O 



over the form and printing it as the said carriage moves towards the 



