1040 



Voltaic Electricity. Section 10: Electrical Oscillations. 



No. 63 270 



63 270 A. 1:8. 



63 270 C. 1:12. 



63270D. 1 : 12. 



63 270 E. 1 : 10. 



63 270 F. 1:8. 



63 270 G. 1:12. 



63,270. Complete Set for demonstrating all essential Experiments with Hertzian Waves and 

 Wireless Telegraphy, after Weinhold, Figs. A J (W. D., Figs. 611619 [556564]) 



The apparatus comprises: 



1 complete Receiver on marble with metal protecting case, Branly Tube (Coherer), clapper, 

 sensitivity relay, accumulator and dry cell, Fig. A; 



1 Transmitter (Vibrator or Radiator) with horizontal spark gap, Fig. B; 



2 concave Mirrors with holders, mi hoard, for reflection, etc.; Figs. C and D. 

 1 plane Glass Mirror for reflection: 



1 Stand for the connecting leads, cf. Figs. D and G; 



1 Sheet Iron Slab, 1 Board coated with Tinfoil, 1 Wire Net, 1 Glass Plate and Wire Grating 



flection: 



1 Paraffin Prism with pasteboard screen, coated with Tinfoil, and holder, for refraction, Fig. 

 2 Glass Mirrors for interference, Fig. F; 

 1 Mirror in frame for polarisation, Fig. G; 



1 Mirror with Glass Cup (as lens) in frame, for polarisation, Fig. H; 

 J Supports: 

 1 Transmitter for wireless telegraphy, Fig. J. 



Cl 



s. .1. 

 16.10.0 



variable- 



for re- 

 E: 



6133,6183. 



6135,6139,6138. 



6134,6137. 



