1835.] Description of a self f erf orming barrel organ. 353 



direction of the dart (which is done by a thumb -screw 

 fixed on the end of its axle) the spring, is let down on 

 the disk, x, and stops the motion of the fly, and conse- 

 quently of the barrel movement. — At the same time the 

 lever, s, which is fixed on the axis of the excentric, is 

 lifted up, and the line, k, having one end fastened to the 

 lever, s, and the other end to the stop rod, e, f, and pass- 

 ing over the puliies, r, q, being also lifted or pulled up by 

 the lever, the stop rod, e, f, is raised, and acts on the fly 

 wheel 8, stopping both movements simultaneously. 



17. — I proceed in the last place to describe the method 

 of striking the bell, or giving notice when the weights E, 

 F, figure l,have been wound up high enough. Let, h, in 

 figure 10, represent a pin fixed on one of the weights so 

 as to come in contact with the end of the square elbow 

 e, d, f.— Now as the elbow moves on a centre at, e, the 

 effect is that the point, f, is lifted up as the weight rises, 

 and the hammer, b, is thrown into the position, b*, shown 

 by the dotted line : but when the weight has risen as 

 high as, f *, the pin, h, is clear of the elbow, which being 

 suddenly left free falls back by the pressure of the spring 

 s, into the situation shown in the sketch, and causes the 

 hammer, b, to strike a single blow on the bell, a, indicat- 

 ing that the weight has risen high enough, and that the 

 winding should cease: — But as the movement is for the 

 weight as it ascends, and is not required as it descends, 

 and as the projecting point, f, would, as the weight sinks, 

 be in the way; f, is made moveable on a centre at, g, 

 shown by a dot ; so that acted on from above the small 

 piece, g, f, moves on its own centre, which is different 

 from the centre, e, of the elbow piece : but it is 

 fixed upon the elbow, and causes the whole appa- 

 ratus to move when acted on from below as the 

 pin or weight ascends. Thus being moveable on its 

 own centre, g, when the weight goes down, it of 

 course allows the pin to slide down quietly without act- 



