ELECTRIC LIGHTING. 



sequence of the liberation of the fly o', the wheelwork c d is 

 allowed to act, the barrel i! makes the wheel S turn in the 

 direction of the arrow, and the two carbons are brought 



FIG. 39. 



nearer together. At the same time, the two sun and planet 

 wheels are turned, but without producing any effect, for they 

 revolve round the wheels h and d; but when the second 

 fly o is liberated the planet wheel e is set in motion by the 

 wheel a and the pignon h, and by acting through the planet 



