1022 



Voltaic Electricity. Section 8: Electric Conduction in Gases. 



.No. 63 119 



Tube with 5 Radiometer with Geissler Tube with 



phosphorescent Bouquet Tube Coral 



Minerals 



Tube with Tube with artif- Tube with 



Lava icial Ruby Double Spar 



Tube with 

 Dolomite 



Tube with 2 Cape Dia- 

 monds and 2 Ceylon 

 Rubies and 1 Apatite. 



63 124. 



63 119. 1 : 8. 



63,119. Collection of 8 Vacuum Tubes and 1 Geissler Tube, 55 cm high, with 2 fluorescent 

 liquids, Figure 



The set comprises: 1 Tube with Coral ( 0.12.6); 1 Tube with Dolomite ( 0.12.6); 1 Tube 

 with Double Spar ( 0.12.6); 1 Tube with Lava ( 0.12.6); 1 Tube with 5 different Phosphorescent 

 Minerals ( 0.16.0); 1 Tube with artificial Ruby ( 1.2.0); 1 Tube with 2 Cape Diamonds, 2 Ceylon 

 Rubies, and 1 Apatite ( 2.10.0); 1 Radiometer with bouquet ( 1.10.0) and 1 Geissler Tube with 

 2 fluorescent liquids ( 1. 5. 0). 



63.122. Vacuum Tube with 2 Cape Diamonds, 2 Ceylon Rubies, 1 Apatite (cf. Fig. 63,119) . 



63.123. Vacuum Tube of Didymium-cerium Glass, phosphorescing red, with 7 ground glass 

 stones, which when mixed with metallic oxides phosphoresce differently 



63.124. Vacuum Double Bulb, after Winkelmann, Figure, for showing oscillatory dis- 

 charges with spark-gap connected in parallel (Ztschr. f. d. phys. u. chem. U. 17, 1904, 

 p. 37) 



Goldstein Tubes. 



63.125. Deflection Tube, cathode consisting of 2 parallel aluminium wires, with base . . . 



63.126. -- idem, cathode consisting o.f a star-shaped bent wire, Figure, with bu.sc. . 



63.127. - - idem, cathode consisting of star-shaped cut-out concave mirror, F i g u r e, 



w r ith base 



63,128. Vacuum Tube, with piece of gold or stamped aluminium sheet, with base, Figure 



63,129. Canal Ray Tube, F i g u i >, with base 



The cathode (a) consists of a grill-shaped aluminium sheet, while (b) is the anode. Violet rays 

 are emitted from the canals formed by the grill. These rays are difficult to influence, and indeed 

 this can only be done by powerful magnets, while the cathode rays which cause the phosphorescence 

 of the glass and also the anode light-pencil in the lower tube can, as is well known, easily be deflected. 



s. d. 

 9. 10. 



2. 10. 

 1. 7.0 



1. 4.0 



0.11. 

 0. 11. 



0. 11.0 

 0.11.0 

 0. 17.0 



Cl. 2948, 6509. 



