1014 



Voltaic Electricity. Section 8: Electric Conduction in Gases. 



No. 63 020 



bed 

 63 020/24 a-e. 



63028. 1 : 5. 



63032. 1 : 6 



Section 8: Electric Conduction in Gases. 



' ~ <" . r- ....... 



Geissler Tubes. 



Electric Eggs and Geissler Tubes evacuating automatically: see p. 830, items Nos. 60,577/8. , 



6 Geissler Tubes of different shape and colour, in cardboard box. Figs. 63,020 to 63,024 a e 

 show a few of the shapes. 



List No. 63,020 63,021 63,022 63,023 63,024 

 Approx. length cm 12 16 20 25 30 



0.5.0 0.6.0 0.8.0 0.10.0 0.12.0 



63.025. New Geissler Tubes consisting of five kinds of glass and lighting up in different colours 

 (dark red, violet-purple, yellow, uranium green and neutral), about 20 cm long . . . 



63.026. - - idem, approximately 30 cm long 



63.027. - - idem, approximately 40 cm long 



8. d. 



0. 3. 

 0. 4. 



o. :>. n 



63.028. 6 Geissler Tubes of different shape and colour, Figure, each about 20 cm long, 

 in small wood box with glass lid, with switch to permit of one tube after the other being 



lit up without having to change the leads 1. 12. o 



63.029. - - idem, the tubes approx. 25 cm long . 1. IS. o 



63.030. - - idem, the tubes approx. 30 cm long 



63.031. 4 Geissler Tubes approx. 20 cm long, in cardboard box, as follows: 



1 tube with fluorescent liquid, 1 ditto with phosphorescent substance, 1 ditto with uranium 



glass beaker, 1 ditto with spirals 



63.032. 6 Geissler Tubes, Figure, approx. 25 cm long, in cardboard box, as follows: 



1 tube with fluorescent liquid, 1 ditto with phosphorescent substance, 1 ditto with 2 gases, 

 1 ditto with uranium and white glass, 1 ditto changing colour when heated, 1 ditto containing mercury 

 which lights up when shaken 



63.033. 7 Geissler Tubes approx. 35 cm long, in cardboard box, as follows: 



1 tube with 2 fluorescent liquids, 1 ditto with 2 phosphorescent siilistiinco, 1 ditto with 2 Gases, 

 1 ditto with uranium and white glass, 1 ditto changing colour when heated, 1 ditto lighting up when 

 shaken, 1 ditto with stratified light 



63.034. Geissler Tube, with 1 fluorescent liquid, cylindrical, F i g 11 r e, approx. 25 cm long 



63,035. -- idem, with 2 liquids, cylindrical, approx. 35 cm long 



63.036. Geissler Tube, Figure, with four fluorescent liquids, with wood base, 30 cm high 



63.037. -- idem, with 2 fluorescent liquids, on wood base, approx. 25 cm high . . . . 



2. 



0. 12. 



0.16.0 



1. 10. (> 

 0. 3. 

 0. 6. 

 0. 10. 

 0. 5.0 



( 'I. G.'.lfi, 6520, 6517, 6518, 6519, 2898, 2899. 



