343 



and thereby to close the short end or teeth of the dog, the more rigidly in proportion 

 to the pressure exerted. Directly the fillet has passed through the cylinders, the dog 

 springs slightly by the elasticity of the fillet, and thus releases itself from the chain 

 B ; at the instant of release the weight, h, over the foremost wheels falls, and by its 

 fall lifts the hooks / so high as to admit .of their escaping contact with the circulating 

 chain B. The position of the teeth of the dog is shown between x, x, in Jiff. 1533. 



1533 



^Q^g^E^ffr^R^g 



The flatted part of the fillet is just so thin as to admit of its passing easily between 

 the cylinders until seized by the dog, but the part which is not thinned comes against 

 the cylinders, x, and requires considerable force to drag it between them. The cylin- 

 ders do not rotate ; in fact, they may be considered as forming part of a solid mass. 

 As the cylinder wears, the screws of F may be loosened to permit the shifting of the 

 abraded part, so that the whole circumference of the cylinder may be used. The 

 lower cylinder is laid on the bed D, and is clamped there by a cheek fastened on to F 

 by three screws, the holes for which are shown on x ; the upper cylinder is fixed to 

 the mass, D, by a precisely similar arrangement. The beds c, D, are held perpendicu- 

 larly by the points of the screws E ; and we may now view the cylinders as secured to, 

 and forming part of, their beds. The distance between the cylinders is regulated by 

 the capstans, H, which separate the beds of the cylinders, and so separate the cylinders. 



1534 



The accuracy of this adjustment is all-important, because the distance between the 

 cylinders determines the thickness of the fillet which passes between them. The bed, 

 i), of the upper cylinder is required to be moveable at pleasure ; it is therefore pro- 

 vided with four wedges, two of which, c, c, are cut so that if looked upon from the 

 top a round hole shows itself, and through this hole the end of the screw G, which 

 at this point, L, is plain, and has a neck turned in it, passes, with its head beneath 

 the wedges and against the upper D. So soon as this is effected the wedges A, B, 

 are pressed into their places, and these holding c c together, cause them to secure 

 o by its neck ; if, therefore, G be now caused to rise, the block D must rise with it, 

 but the head of this screw rests on the solid block D, while its neck is just so long 

 as to admit of this without itself being pressed against the wedges c, c. G is a very 

 fine-cut screw, which fits into a female-screw cut in the frame of the head of the 



