VJ. -CURRENT.-;. 281 



a solution of cyanide of potassium and mercury with electrodes of 

 mercury. George Gore, F.R.S. 



The effects are produced by the alternate rapid formation and destruction 

 of films upon the positive electrodes. (See Proceedings of the Royal Society, 

 Vol. 12, p. 217.) 



1395a. Electro Capillary Force Machine, after Lippmann. 



R. Jung, Heidelberg. 



To set this machine in action, the two wide glass vessels are first filled 

 to a height of 1 to 3 cm. with mercury, placed in position in the glass trough, 

 and then filled two thirds with pure dilute sulphuric acid. Then the two bundles 

 of thin glass tubes are pushed repeatedly down into the mercury, so that the 

 air is driven out, and the tubes and their intervals are quite filled with 

 mercury and acid. Then the bundles are fixed by screwing to their frames, 

 so as to be about half immersed in the mercury, and to stand in equilibrium in 

 the middle of their respective vessels. If the little cups of the key be now 

 filled with mercury, and the crank which works it so placed that the current 

 is reversed a little before the opposite crank comes to its dead point, the 

 machine (having been connected with the poles of a Daniel) will com- 

 mence working, aud may make as many as 100 revolutions in a minute. A 

 Meidinger element keeps the machine in action for months. 



1395b. Apparatus for electric osmose. 



Prof, Ilittorf, Munster. 



In each of the three divisions formed in the glass cylinder by the clay 

 plates the electric endosmose (when the vessel is quite filled with the solution 

 of an electrolyte) is produced or prevented according as, on passage of the 

 current, the three openings are free or are closed. With the arrangement it 

 is proved that the transference of the ions is quite independent of the electric 

 endosmose. (Fogg. Ann., Bd. 90.) 



(J. EFFECTS DUE TO THE FORCE BETWEEN CURRENTS AND 

 MAGNETS. 



1396. Apparatus for showing the Rotation of a Bar- 

 magnet on its axis by the passage through it of an electric 

 current. George Gore, F.ff.S. 



(See Proceedings of the Royal Society, Vol. 24, p. 121.) 



1397. Apparatus for showing the notation of a Copper 

 Wire upon its axis between the poles of two magnets by passing- 

 through it an electric current. George Gore, F.R.S. 



(See Proceedings of the Royal Society, Vol. 24, p. 121.) 



c. EFFECTS DUE TO THE FORCE BETWEEN CURRENTS AND 

 CURRENTS. 



1398. Apparatus for demonstrating the Laws of Ampere. 



Geneva Association for Constructing Scientific Inxtrii- 

 ments. 



The mode of suspension used in this apparatus allows rhe conductor to 

 make a complete revolution. 



