No. 63 348. 



Wireless Telegraphy. 



1053 



MAX KQHL CHEMMTZ 



63 338. 1 : .->. 



63 341. 1 : 10. 



63 340. 1:10. 



63 345. 1 : 4. 



63,3:59. Round Relay No. 63,3.38, Coherer No. 63,336, and Shaking Device No. 63,337, mounted 

 together on one polished mahogany slab, with all leads and the necessary terminals 



Standard Ink Writers: see Nos. 62,329/32, p. 1049. 



63.340. Assembled Receiving Station, Figure, comprising 1 adjustable steel Coherer 

 No. 63,336, 1 clip and shaking device No. 63,337 for same, 1 round pattern polarised 

 relay No. 63,338, and 1 standard ink writer No. 62,329 with automatic release No. 62,332, 

 mounted together on one polished mahogany board 



63.341. Magnetic Detector after Marconi, Figure, complete with telephone and 110 Volt 

 D. C. motor 



This apparatus is splendidly adapted for demonstrations. 



If a motor for different voltage or current is desired, this should be stated when ordering. 



63.345. Zickler Tube for opto-electric Telegraphy, Figure, with quartz plate and adjustable 

 quartz lens (Ztschr. f. d. phys. u. chem. U. 12, 1899, p. 43; E. T. Z., 1898, pp. 474 

 and 487) 



Opto-electric Telegraphy by Zickler's method is based on the phenomenon of a spark gap allowing 

 i he sparks to pass when submitted to radiation from ultra-violet light, the sparking ceasing, however, 

 when radiation is stopped. The spark gap is enclosed in an evacuated glass tube having a quartz 

 window at one end ; in front of this window is fitted a sliding, convex, quartz lens which condenses the 

 ultra-violet rays on the cathode. The ultra-violet rays are shut off by inserting a thick glass plate in 

 the luminous pencil of the arc lamp. 



As to the source of light to use, an electric arc lamp (say, that of a projection lantern), the 

 condenser of which has been removed, is sufficient for demonstration purposes. For condensing the 

 light on the tube it is advisable to use the following quartz lens when the distance in question is 

 somewhat large. 



63.346. Quartz Lens 38 mm diameter 



63.347. Glass Plate, 200x150x8 mm 



s. d. 

 15. 0.0 



29. 10. 



11. 0.0 



3. 0.0 



0. 12. 

 0. 3.0 



63,348. Geissler Tube for Zickler's opto-electric Telegraphy 0. 3. 



The Geissler tube is put in series with the induction coil and spark gap. While the Geissler Tube 

 only gives a dull glow when there is no sparking over in the Zickler tube, it lights up much brighter 

 with the passage of sparks. 



Cl. 2623, 3048, 

 3057.3061. 



