X... 63 287. 



Hertzian Experiments. Stationary Electric Waves. 



1043 



63 287. 1 : 8. 



63.284. Secondary Conductor after Zehnder, Figure, on wood stand having leivellng s. d. 

 screws (Wied. Ann. Vol. 52, 1894, p. 53) 1. 4. 



63.285. Discharge Tube after Zehnder, Figure 0. 18. 



The tube has two leads for connecting with the secondary conductor halves and three leads for 

 connecting with the high-voltage accumulator or the shunt current of the induction coil replacing the 

 current of the accumulator (cf. Zehnder, Wied. Ann., Vol. 47, 1892, pp. 77 and 90; Vol. 49, 1893, pp. 549 

 and 724; Vol. 52, 1894, p. 34). 



High-voltage Storage Batteries: see p. 856. 



63.286. Apparatus for demonstrating and measuring Stationary Electric Waves on Wires 

 after Lecher, Figure (Wied. Ann., Vol. 41, 1890, p. 850), without Lecher tube or 

 induction coil 6. 0. 



The apparatus consists of two pairs of zinc disc 400 mm diameter, fixed on insulating stand and 

 provided with connecting terminals; two of these discs are capable of motion so as to be able to vary 

 the mutual distance of the discs. At the centre of the baseboard is the spark gap formed of two 30 mm 

 In a^s spheres, 7.5 mm distance apart, these spheres being nickelled and fixed on ebonite pillars. These 

 discharge spheres are in direct connection willi the two fixed zinc discs by wires, and wires 1 mm thick 

 lead from the movable zinc discs to two terminals, on ebonite pillars, at a mutual distance of 300 mm. 

 From here two parallel running wires 9 m long lead to a heavy, adjustable iron pillar stand. Of the 

 two wire clips, provided with ebonite insulating knobs, one is arranged for suspension and for easily 

 sliding along, and the other for fixing by screws. 



(>:!. i>7. --idem, modified by Weinhold (W. D. Fig. 609 and 610 [554 and 555]), without 



Lecher tube or induction coil, Figure 2. 10. 



Cl. 3030. 

 3580. 



66* 



