No. 60 644. 



Oscillatory Discharges. 



837 



60643. 1 : 10. 



60644. 



city when the cocks R and R' are closed. The liquid rises in T and falls in T. After discharge 

 the difference in level disappears suddenly to the amount corresponding to the residuum. 



d. 



60,640. Hydraulic Analogon of the oscillatory discharge of a Leyden Jar, Figure (Gan.- 



Eein. Fig. 786) ' 1. 0. 



60.641. Apparatus for Demonstrating the Oscillatory Character of Leyden Jar Discharges, 

 Figure 



A sheet of cardboard is rapidly passed by the points of a discharger. Tne secondary coil of an 

 induction coil is connected up at the points, the interrupter of this induction coil being short circuited 

 and replaced by the interrupter fitted on the apparatus, and the latter interrupter interrupting the current 

 at the moment the cardboard sheet begins its motion. A more or less narrow row of holes is produced 

 on the cardboard strips according as whether a large or small capacity is switched on to the points 

 of the discharger. 



60.642. Lens Disc, as suggested by Boys, for the same purpose, Figure 



An accurately balanced metal disc carries 6 lenses, of which each two are at the same distance 

 from the axis. Each of these pairs is therefore at a different distance from the axis. If the axis is set 

 rotating quickly and the image of a spark projected on to a screen by the three pairs of lenses the 

 result is a concentric ring of light in which the oscillations can be plainly seen. 



60.643. --idem, Figure, with protecting box, D. C. motor for 65, 110 125 or 220 

 to 240 volts, current regulator, spark gap and screen mounted on a board 



Oscillation Analysing Apparatus, as suggested by Grimsehl: see Section on Mechanics. 



Wave Tube, as suggested by Maxwell, for demonstrating the charge and discharge from a 

 Mechanical Point of view: see Section on Mechanics. 



60.644. Apparatus (Lippmann's), Figure, for showing that the discharge of a Leyden Jar 

 can produce mechanical motion and that by the same motion the Jar can again receive 

 a charge (Fr. phys. Techn. II, 1, Fig. 187; Gan.-Man. Fig. 668) 



Cl. 5281, 5353, 

 5378, 5605. 



4. 10. 



4. 0.0 



12. 0.0 



3. 0. 



