1875.]. of Bar-magnets and Conducting-wires. \%7 



could be fixed by a screw C, which encircled the split end of the tube B. 

 The fine adjustment was effected by means of the screw D, the lower 



rig. 2. 



RBIBBI 



end of which rested upon the top of a tall brass rod inside the brass 

 pillar. The upper and lower fixed coils or rods E and F wer« insulated 

 from the brass clips Gr and H, and the battery was attached to the 

 binding-screws I and J. K is a binding-screw for connecting with the 

 upper coil or rod. 



14. I also obtained rotation of the iron wire whilst the wire was in a 

 horizontal position, its ends resting in hollows in the ends of the iron 

 axes of the two fixed coils, and the ends of those axes and of the movable 

 wire lying upon the surface of pools of mercury in small watch-glasses. 

 The movable iron wire was enclosed in the axis of a thin iron tube 

 within a fixed coil, having appropriate and similar poles at its ends. 

 The current from the thermopile produced very rapid rotation. This 



