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66 The Optical Magic Lantern Journal and Photographic Enlarger.
Fig. II.). This part is pivoted to the leg of the
framework of the machine as shown in Fig. I. The man’s thigh (pv, Fig. II.) is then pivoted to E, and to the body by a stationary pivot (ny, Fig. I.).
_The head, arms and scythe are cut out of one piece of metal (a, Fig. II.), which is pivoted to the body at m (Fig. 1.).
SECTION
qo WIRE ROD P
Fic.2.
The rod c ( arms to the thigh, being pivoted to both as represented in Fig. I. The wire rod Pp is attached to the grinding-stone by means of the fixed pin in the latter, and to the treadle in the manner shown at J (Fig. I.),
The various parts of the grinder and his machine having now been carefully fitted up, it remains to explain how they are actuated. Reference to Fig. III. must be made for this purpose. A shaft 4 cut out of thin metal, and furnished with a slot, is screwed to the framework of the slide as shown. The shaft is provided with a grooved wheel 5, to which is fixed
Fic. 3.
a small handle6. This wheel is attached to the shaft 4 by means of a special screw, having a shoulder as shown in Fig. 1V. This screw is furnished with a winged nut (9, Fig. IV.). The manner in which this part of the slide is fitted together is clearly shown by Fig. V. This figure, it should be mentioned, is a sectional drawing of the shaft and wheel, the section being made through a B (Fig. III.).
The object of the shoulder to the screw 10 (Fig. V.) is there explained. It leaves the wheel free to revolve on its axis (the shoulder itself) even when it is fastened, by means of the winged nut 9, to the shaft 4.
In this diagram (Fig. V.) 7 represents the handle attached to the wheel, 8 the screw by means of which it is attached, and 11 the string which passes round the groove in the wheel, as will be presently shown.