No. 63 204. 



Radioactivity. 



1029 



63 200. 1 : 8. 



63 204. 1 : 10. 



Accessories : 

 63,185. Reading Telescope with micrometer ocular for same (for accurate measurements) 



s. d. 

 2. 16. 



63,186. Ebonite Rod with Rubber '. I 0. 3. 



63.187. 6 Closing Discs 



63.188. Disc with Uranium Oxide a* radioactivity standard 



63.189. Carrying Case for the Electroscope with accessories 



63.200. Fontactoscope after Engler and Sieveking, Figure, for determining the radioac- 

 tivity of waters (Schiffner, Eadioaktive Wasser in Sachsen), with accessories .... 



The foregoing price includes: 



(a) 1 Electroscope after Elster & Geitel, modified by Engler & Sieveking, with amber insulation 

 ( 3.5.0); 



(b) 1 Arrangement Jor Parallax-free Reading of the Deflection of the Leaves, consisting of a scale 

 with mirror and sliding magnifier ( 1.13.0); 



(c) 1 Dissipation Cylinder for suspending ( 0.10.0); 



(d) 1 Can of nickelled brass sheet, 10 litres content, for spring water testing ( 1.0.0); 



(e) 1 Can with plate, of nickelled sheet brass, for investigating solids ( 1.3.0); 



(f) 1 Rubber Stopper with glass stopcock, for closing the aperture at the bottom of the can ( 0. 7. 0); 



(g) 1 Rubber Stopper for closing this aperture during transit ( 0.1.0); 

 (h) 1 Large Rubber Stopper for closing the neck of .the can ( 0.4.0); 



( i) 1 Melta Lid for the neck of the can, arranged for setting up the electroscope ( 0.15.0); 



(k) 1 Zamboni ,Drv Pile, 300 350 volt pole-tension, for charging the electroscope; as desired, with 



a stand for suspending the pile, or with a metal sheath, in which both poles are insulated, so 



that the pile keeps well ( 1.13.0); 

 (1) 1 Transit Cass with leather carrier ( 2.2.0). 



Instead of the dry pile listed under No. 63,200k we supply, if desired: 



63.201. Zamboni Pile with protecting neck. The poles of the pile are laid in ebonite 

 plates having artificially enlarged surfaces. A special needle permits of utilising also 



0. 8. 



1. 0. 

 0. 18. 



12.10.0 



sub-divisions of the pile (alone 2. 18. 0) 



Extra price 



63.202. Case for Electrometers Xos. 63,200 a and 63,200 b, for use where a carrying case 

 is not desired. Decrease in price for this Case instead of Transit Case 



63.203. Case, for Electrometer No. 63,200 a and b alone 



63,204. Electrometer Jor Radioactive Measurements, especially on waters, after H. W. 

 Schmidt, Figure, Travelling Apparatus with reading microscope, dissipation vessel 

 with level, stand, agitating flask, rubber bellows, rubber tubing, stop-watch, thermo- 

 meter and charging rod (Physikal. Ztschr. Vol. 6, 1905, p. 561) |14. 0. 



1. 5.0 



1.10.0 

 0. 8.0 



A complete special list concerning apparatus 63,200 63,204 sent on application. 

 Exact directions for use are appended to each apparatus. 



Cl. 5388, 5265. 



