

TO IN I NO MACHINERY. 



PtlTI CC1. 



Fig. 3. 



Tif.1. 



Fig. 1. 



In ill revolution, it intercept! the roller g, at the extre- 

 mity of the lever H, and by moving it outwards, raises 

 up (he screw ; but the moment it has passed by, the screw 

 is returned, to cut the plate, by the re-action of a spring, 

 which draws the rod M. This is attached to the arm N, 

 of the lever HN, and therefore draws the roller g back 

 the instant the cam has passed by. The rod M draws 

 from a link m fitted upon the arm N of the lever, and 

 moveable along it by means of a screw p, so as to adjust 

 the power of it at pleasure, by throwing its action at a 

 greater or less distance from the centre of motion G. 

 The motion of the machine can be discontinued at plea- 

 sure by means of a catch, Fig. 3 ; it is marked OP, and 

 moves on the centre P, being constantly pressed upwards 

 by the spring r. This catch is situated crosswise be- 

 neath the arm N of the lever, and when that lever comes 

 back, the hook O catches and holds it up, so as to pre- 

 vent its return. When the machine is required to work, 

 the string s is pulled, to draw down the catch beneath 

 the plane of the lever's motion. This string, as shewn 

 in Fig. 1, comes down to a treddle R, on the ground, 

 before the machine. The boy who attends the machine, 

 places the plate over the bed e, and puts his foot on 

 the treddle when he wishes the machine to work. This 

 relieves the lever N from the catch, and then, every time 

 the cam of the wheel K comes by, it lifts the roller g, 

 and raises the punch ; but as soon as the cam has passed, 

 the spring makes a stroke, and cuts out a piece of 

 plate, which drops through the bed, and falls out at a 

 spout T. The instant he relieves the treddle, the machine 

 stops, but still the point of the cam strikes the roller g 

 every time it comes by. This is avoided when the ma- 

 chine is to be permanently stopped, by the folio wing means : 

 The centre P, of the catch O P, is fixed at the end of 

 a lever, moving on a centre W, Fig. 3, and having a 

 long handle VV X, Fig. 1 ; therefore in pulling this le- 

 ver, the catch is drawn forwards, and raises the roller g 

 quite out of the reach of the cam L. The lower end 

 of the lever, Fig. 1. moves in a notch in the plate B, 

 and thus retains it when it is drawn forwards. Z is a 

 lever fixed on the axis G, and carrying a sweep, or arch, 

 at the extremity of which is a weight or fly iv, to give im- 

 petus to the stroke of the machine; this is checked, when, 

 at the end of its motion, it strikes against a strong vertical 

 wood spring Y, firmly fixed to the framing. The two 

 wheels x, which are indented into each other, are to con- 

 nect the axis G with the socket fitted at the top of the 

 screw e , and there admit of adjustment, by turning the 

 screw round a small quantity, with respect to the lever 

 H, to give a greater or less motion to the screw. The 

 Figure shews the clamps which hold the wheels together. 

 The Figures in our Plate, though they explain the con- 

 struction of the machine, do not exhibit the real ap- 

 pearance of it, because there arc twelve of these machines, 

 all mounted on the same frame. They are contained in 

 a very elegant circular room, lighted by a skylight, in 

 the centre. The stone basement A A, Fig. 1, is a cir- 

 cular wall, and the plate B ; a ring surmounting it ; there 

 are twelve of the columns C supporting a circular iron 

 ring, or frame D ; and this has some curious cross framing 

 in it, tosupport the axis of the wheel K. K: this, of course, 

 U common to all the twelve presses, which are situated 

 between each pair of the columns C. An immense hori- 

 zontal fly wheel is fixed on the axis above the wheel, to 

 regulate the motion. The springs of the rods N, are con- 

 cealed within twelve columns, which ornament the room, 

 and appear to support the ceiling. The whole is moved by 

 a steam engine of sixteen horse power. 



The bUuki thai cut are next to be adjusted by filing 



the edges, to bring them to the exact weight $ but by Coining 

 the system adopted in the last rolling very little adjust- M"h'ny 

 ment is requisite, and as soon as this is performed, the * '~~ ' 

 edge is milled. This operation, as before mentioned, is not Adjusting 

 shewn in our mint ; burwe believe Mr Boulton has im- 'he Maulw. 

 proved this process as well as the others ; at least some 

 of his coins have milling of a kind very different from 

 any other, and which, we think, could not be done by 

 the machine we have represented in Plate CCI. 



The coining press, which is the most beautiful machine Boulton'* 

 of the whole series, comes next to be described, (see "'n' n g 

 Plate CCU,) which is a perspective view of one of the P ress - 

 presses complete: A A is a solid stone basement support- P. 

 ing the whole ; upon it are erected four columns, rising CCII. 

 to the ceiling of the room, and in the centre between 

 these, the press is placed. Its frame marked KK, is 

 screwed down by four bolts shewn at the bottom ; b is 

 the screw, or rather the spindle of it, the screw itself 

 being concealed within the frame of the press. On the 

 top of the spindle, the fly DB is fixed, and over this a 

 hollow spindle C, like an inverted trumpet, conveying 

 the motion to the press, from machinery contained in the 

 apartment above. The weights BD, at the extremities of 

 the arms of the fly, are limited in the quantity of their 

 motion, by checks affixed to iron beams E and F, ex- 

 tending from one of the columns to the other : These 

 receive the blow of the fly, in case the press should ever 

 make a stroke without a blank being between the dies, 

 and are therefore made exceedingly strong ; the columns 

 are of oak. The recoil of the fly, after having struck a 

 com, is checked by ita coming against a piece of wood 

 G, which is fitted into the tube H, fixed to the iron 

 beam E, and having a concealed spring to ease the blow. 

 The upper or moving die is beneath the screw ; for this 

 press has no slider like the old one, but the dit turns 

 round with it whilst it is making the impression. The 

 screw b b is, as the Figure shews, cylindrical at each end, 

 and is fitted in very accurate bearings, adjustible by 

 screws at a a above, and at c c below ; between these it 

 is cut into a worm or screw, and is received in a proper 

 nut, but it depends on this only for its ascent and descent, 

 the fitting* at the ends keeping it truly vertical. Fig. 5. Fir. 5. 

 explains, by an enlarged view, the connection of the upper 

 die with the screw at this place; b is the lower point of 

 the screw ; it has a ring d fixed on it, having a leaf or 

 tooth projecting downwards, and entering a recess made 

 in a ring e, of similar dimensions, which is the upper 

 part of a piece^', forming a box, furnished with screws, 

 to hold the upper die ; the point of the sere w acts upon this 

 piece, and to keep it always in contact therewith, the ring 

 e is suspended in a collar g ; this has two arms, to which 

 bolts /i // are united by screws ; and these bolts (see Fig. 

 1.) passing up through holes in the solid frame, are 

 united to another collar k, which fits on the screw, and 

 rests upon a shoulder formed on it ; so that by the ad- 

 justing screws on the rods h, the collar is always kept 

 tight, and accompanies the screw in its motion. The 

 lower die /, Fig. 2. is held in a box I, furnished with pj_ 2< 

 adjusting screws, which box is screwed down upon the 

 bottom of the frame of the press, as is seen in Fig. 1. Fig. 1. 

 Now a piece of metal being placed on the upper die 

 when the machinery moves the "press, and forces the 

 upper die down upon it, the tooth of the ring d, Fig. 

 5. obliges the die to turn with it, so that the coin is 

 struck with a twisting motion, which is supposed to give 

 a better impression ; but in the recoil of the screw the 

 die does not at first turn round, or it would inevitably 

 cut away all the raised parts of the impression. This is 

 effected by giving the tooth of the ring d considerable 



