. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. achine, of which a brief description maygive my readers a conception of this kind of manufacture. Its principles are similar totkose of Dr. Churchs more eleborate apparatus. The rods or bars having been prepared in the usual way, either by rolling or hammer-ing, or by cutting from sheets or plates of iron, called slitting, are then to be made red-hot, and in that state passed through the following machine, whereby they are at once cutinto suitable lengths, pressed into wedge forms f
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. achine, of which a brief description maygive my readers a conception of this kind of manufacture. Its principles are similar totkose of Dr. Churchs more eleborate apparatus. The rods or bars having been prepared in the usual way, either by rolling or hammer-ing, or by cutting from sheets or plates of iron, called slitting, are then to be made red-hot, and in that state passed through the following machine, whereby they are at once cutinto suitable lengths, pressed into wedge forms for pointing at the one end, and stampedat the other end to produce the head. A longitudinal view of the machine is shown indg. 749. A strong iron frame-work, of which one side is shown at a a, supports thewhole of the mechanism. 6 is a table capable of sliding to and fro hoiizontally. Upon * For further details, see Newtons Journal, 2d series, vol iii. p. 882 NAILS. this table are the clamps, which lay hold of the sides of the rod as it advances: as alsothe shears which cut the rod into nail These clamps or holder? consist of a fixed piece and a moveable piece; the latter beingbrouarht into action by a lever. The rod or bar of iron shown at c, having been maderedhot, is introduced into the machine by sliding it forward upon the table b, when thetable is in its most advanced position; rotatory motion is then given to the crank shaft d,by means of a band passing round the risger pulley e, which causes the table b to bedrawn back by the crank rod /; and as the table recedes, the horizontal lever is actedupon, which closes the clamps. By these means the clamps take fast hold of the sides ofthe heated rod, and draw it forward, when the moveable chap of the shears, also actedupon by a lever, slides laterally, and cuts off the end of the rod held by the clamps: thepiece thus separated is destined to form one nail. Suppose that the nail placed at g, having been thus br
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