584 DISTRIBUTION UPON CONDUCTORS. 



mercury would issue from the same orifice under ordi- 

 nary circumstances. 



To prevent the insulation of the glass vessel, a wire should lead 

 from the inside of the vessel to the table or to the ground. The 

 cohering jet may be produced by rubbing a piece of sealing-wax, 

 not more than 2 cm in size, against the coat-sleeve, and then bring- 

 ing it near the jet. A rod of glass which is strongly electrified 

 effects the cohesion of the jet easily at a distance of l cra . The spout 

 should be kept slightly inclined during these experiments, so that 

 the descending water may not interfere with the ascending jet. 



46. Distribution of electricity upon conductors. Elec- 

 trical Machine. Fig. 312 is a sectiofy of an insulated 

 spherical conductor of sheet brass, fixed upon a glass 

 rod provided with a wooden support. There are two 

 openings in the ball, one horizontal which passes right- 

 through, and one vertical which leads from the top to 

 the middle of the sphere. 



The ball is electrified by placing a rubbed glass rod 

 upon the top of the ball and drawing it over its surface, 

 taking care not to touch the ball with the hand. 

 When the glass rod is strongly electrified, it is sufficient 

 to draw it once over the conductor; otherwise this 

 should be done two or three times, having rubbed the 

 glass rod each time again. 



The conductor is now touched at some point with the 

 proof- plane, and the latter brought in contact with an 

 electroscope. Observe how far the gold leaves diverge, 

 arid remove the charge of the electroscope by touching 

 it with the hand. Bring the proof-plane in contact with 

 another point of the conductor, communicate the charge 

 again to the electroscope, and the divergence of the 

 leaves will be the same in the second experiment. It 

 follows that the conductor was equally strongly electri- 



