184 Mr. W. Craig Henderson. On Electrical Effects 



closed at the bottom and having a tightly fitting asbestos plug at the 

 mouth. Through a small hole in the asbestos plug there passed a 

 tightly fitting glass tube, G, only a little longer than the thickness of 

 the plug. A stout bare copper wire, C, passed through this tube G 

 without touching the sides, and had a copper disc at the end inside 



Bunsen Burners, 



the iron cylinder. Outside the cylinder, this wire passed direct to the 

 insulated quadrants of an electrometer E, and was siurounded 

 throughout this portion of its length by a metal guard-tube D, which 

 screened it from outside electrostatic influences. Besides the fastening 

 to the electrometer, the sole supports of the wire C were two parafiin 

 plugs fixed into the ends of this tube D. The iron cylinder A, the 

 tube D, and the uninsulated quadrants of the electrometer E, were 

 connected by a wire with one another and with the sheath of the 

 electrometer, denoted by S in the diagram. 



The heat to fuse the sodium was supplied by two Bunsen burners 

 placed below the cylinder A ; and in order to protect the insulated 

 wire from the hot gases rising from the burners, a metal screen M was 

 fixed on the cylinder and bent up on the side remote from the electro- 

 meter to serve as a funnel. 



