1030 



Voltaic Electricity. Section 10: Electrical Oscillations. 



No. 63206 



Section 10: Electrical Oscillations. Wireless Telegraphy. 



63 206. 1 : 8. 



Apparatus for Tesla's Experiments with Currents of High 



Frequency and Tension. 



(cL in this respect Ztschr. f. d. phys. u. chem. U. 9, 1896, p. 139.) 



(a) For small-scale Experiments with an induction coil of 60-150 mm spark-length. 



63,206. Complete Apparatus for the Experiments with Currents of High Frequency and Ten- 

 sion, after Tesla, with Elster & Geitel High Tension Transformer, Figure. . . . , 9. 10. 



The apparatus consists of: 1 Leyden jar 40 cm high and 1 spark micrometer with zinc points, 

 all mounted on polished oak board; 1 Elster & Geitel high tension transformer, of. Fig. 63,210, and 

 1 sparking pillar, cf. Fig. 63,216; 2 induction spirals insulated from each other by a glass cylinder, 

 the secondary spiral carrying a glow lamp, cf. Fig. 63,213; 1 copper stirrup with 1 gl&w lamp for the 

 impedance phenomenon, cf. Fig. 63,219; 2 brass plates as conductors, cf. Fig. <>.'?. 222; 2 circular 

 thick copper wires for concentrating the brush discharges, cf. Fig. 63,225; 2 parallel wires for the 

 same experiment, cf. Fig. 63,226; 1 Tesla lamp with a fine, long filament and an external electrode 

 and with fittings, cf. Fig. 63,227; and 1 electrodeless Tesla tube 50 cm long, cf. Fig. 63,228. 



In addition it is advisable to provide a few of the Tesla Tubes listed under Nos. 63,232 63,240. 



(b) For Large-scale Experiments with an Induction Coil of 200600 mm spark-length. 



The most important apparatus and those suitable for forming a collection of in- 

 struments on the subject are marked f. 



t 63,207. Leyden Jar Battery, Figure, with 2 jars 40 cm high, for connecting in sc- 

 ries, on polished wood board j 2. 6. 



CI. 6118. 



