1835] Description of a self performing barrel organ, 345 



5. — Figure 4 represents the plan of the wheel work of 

 figure 3 ; the figures 1 to 8 in this plan, correspond with 

 the figures in figure No. 3. — Thus 1 is the barrel, 2 the 

 ratchet wheel, &c. 18 is the pin of the barrel by which 

 it is v/ound up by the handle A in figure 1. The wheel 

 4* is the wheel spoken of in the last paragraph as work- 

 ing into the wheel 5, This wheel 5 carries a pin 15 

 which enters a hole in the end of the organ barrel. The 

 axis of the wheel 5 is hollow, being bored cylindrically 

 throughout as shown by the dotted lines from 17 to 16. 

 The spindle or axle of the organ barrel rests in this 

 cavity being entered into it at \1 , while the pin 15 

 enters a cavity or hole at the end of the barrel, as just 

 mentioned. It is clear therefore that the axle of the 

 barrel, and the axis of the wheel 5 are concentric, and 

 that when the wheel turns, the barrel must turn with it. 

 The wheel 6 is fixed on the axis of 5 giving motion to 7, 

 on the axle of which is a pinion 10 having 8 teeth. This 

 pinion gives motion to the wheel 1 1 at right angles to it 

 consisting of 80 teeth, and on the axle of this wheel is 

 attached the snail wheel 12. The object of this last 

 train of wheel-work is to give the barrel a horizontal 

 motion, at the same time it is turning on its o wn axis, 

 by which means long pieces of music are adaptable to 

 the Instrument, whereas without a simultaneous horizon- 

 tal and circular motion of the barrel they would not be. 



6. — Figure 5 represents, in section, the manner in 

 which a communication is effected between the barrel 

 and the snail wheel. I, have just described the man- 

 ner in which the snail is worked, which I may here ob- 

 serve makes one revolution while the barrel makes ten, 

 being governed by the pinion 10, of 8 teeth, and the 

 wheel 11 of 80 teeth. The pinion 10, makes one revo- 

 lution to one of the barrel, but working into a wheel 10 

 times its number of teeth, of course it has to travel ten 



