1052 



Voltaic Electricity. Section 10: Wireless Telegraphy (Radio- telegraphy). 



No. 63331 



63332,63333. 1:7. 



63 337. 1 = 3. 



63.331. Thermocouple, F i g u r e, after Rubens, can be used MS a Wave Detector .... 



As galvanometer for above use can be made of an astatic or a moving-coil mirror galvanometer 

 of low resistance and high sensitivity. 



Valve Tube as Audion (Wave Detector): see under Xo. 63,136, p. 1024. 

 (b) Small-cale Apparatus for Wireless Telegraphy. 



63.332. Righi Radiator, Figure, consisting of baseboard and two ebonite pillars on tin- 

 free ends of eaeli of which a brass rod with brass sphere rotates in hinges, together \\ith 

 terminals, but without the accessories illustrated 



63.333. Key, Figure, with extra-thick platinum contacts and long ebonite push . . . 



63.334. Key, Figure, for heavy currents 



The key is arranged in such manner that the arc formed on interrupting, and forced upwards 

 by its own heal. is not deleterious to the apparatus. One of the contacts is interchangeable, bi'in.': 

 made of carbon; it must always be connected with the positive pole of the current lead. 



The key. which is specially adapted for working induct inn coils having Wehnelt Interrupter, is 

 nl extraordinary resisting powers as constructed. 



63.335. Morse Key for currents to 50 amperes. Figure, with thick platinum contacts and 

 electromagnetic spark extinguisher 



The key is intended for heavy currents as produced when working the induction coil with the 

 \Velmeli break. 



63.336. Adjustable Steel Coherer, with filling material 



s. d. 

 1. 0. 



2. 0. 

 "2. -2. 

 1.12.0 



63.337. Device for Clipping and Shaking the Coherer, Figure, suitable for Cohere] No. 63,336. 

 Price without Coherer 



63.338. Round pattern polarised Relay, Figure, having resistance of approx. 7,0(10 ohms, 

 with four polarising cells for preventing sparking 



( - 1. 4675. 3058, 

 3055. 6171. 



8. 0.0 



1. 6.0 

 3. 10. 



9. 0.0 



3059. 



