74 ANNUAL OF SCIENTIFIC DISCOVERY. 



necessity of its fellow projections partaking of the motion. The bar 

 of iron being placed between the dies, which are fixed on the movable 

 table, a chain or cord is attached from the table to the further of the 

 lower rollers, so that the former may be drawn along as the rollers 

 revolve. The upper rollers, which give the pressure, are forced down 

 to their work by weighted levers ; hence, when the machine is set in 

 motion, the table and dies are drawn between the rollers, and the first 

 jointed projection of the top die is forced into its recess in the lower 

 die, thus giving the iron bar the desired shape. The table continuing 

 to advance, is caught between the second pair of rollers, which hold 

 the bar from shifting whilst the second projection is descending ; and 

 in this manner the process goes on, until the whole length of the bar 

 is fashioned into the shape required. The inventors do not confine 

 themselves to this sort of die alone, but propose another mode also, in 

 which both top and bottom dies are made flexible. Scientific 

 American. 



NEW PRESSES FOR BALING COTTON. 



THE Mobile Tribune notices an invention of a new press for baling 

 cotton. The only drawback upon it is, that the bales are round, and 

 round bales are pretty generally proscribed. The Tribune says : - 

 " By connecting it to the gin, the cotton is made up at once into bales, 

 by the same power, and at the same time. To appreciate the great 

 degree of compactness to which a bale may be pressed by this machine, 

 one has only to take a small piece of cotton, and press it slightly while 

 rolling it between the fingers. The principle embraced in this machine 

 is precisely similar --and by a continuous layer of cotton revolving 

 round itself under constant pressure, while the rollers are turning, 

 the bale is formed of extreme compactness, requiring no after com- 

 pressing. It is thought that this mode of forming the bale will super- 

 sede the necessity of roping." A further description of this arrange- 

 ment is given by the inventor as follows : 



" The operating part of my press consists mainly of three wooden 

 or iron rollers or cylinders, the length of each being equal to that of 

 the bale which it is intended to form. These cylinders are placed so 

 as to represent a triangle at equal distances apart, and parallel to each 

 other. When used tor pressing, their surfaces at first approach so 

 closely together as to be nearly in contact ; and as the cotton which 

 forms the bale accumulates between them, they recede from each other 

 under any required pressure, the cotton being fed in between them 

 directly from the cotton gin, by means of an endless apron. 



" An endless chain operating on each side of the machine, imparts 

 motion to the cylinders. 



" The cotton, in passing into the space between the rollers, revolves 

 upon itself so as to form a cylindrical bale, which goes on accumulating 

 until it is of sufficient size and compactness. At this time, the bale is 

 easily secured by passing the bagging so as to surround the bale 

 and the next moment, by knocking away the catches, the cylinders 



