No. 60217. 



Electrometers. 



803 



60 206. 1 : 6. 



60 211 60 215. 1 : 6. 



60,203. 2 Brass Condenser Plates with one insulated metal handle, Figure 



60,204. 1 Copper Condenser Plate and 1 Zinc Condenser Plate 



60.205. Additional Accessories for Grimsehl's Electrometer, Figure 



A zinc and a brass plate, both on brass rods, for showing the varying potential of these metals 

 plunged in an electrolyte; 2 platinum sheets on brass rods for immersing in the same or in different 

 electrolytes; cylindrical dissipation body for showing the discharge action of air, which is ionised by 

 fog, radio-active substances, Rontgen Rays or by an Auer Incandescent Mantle brought near to it; 

 amalgamed zinc plate with brass pin soldered on for showing the discharge action of magnesium tape 

 burned in the neighbourhood of the apparatus on the aluminium leaf charged with negative electri- 

 city; also connecting tube and clamping pieces. 



60.206. Graphite Conductor for demonstrating the potential drop in electric leads, as suggested 

 by Grimsehl, Figure (Ztschr. f. d. phys. u. chem. U. 16, p. 11). Price, exclusive 

 of cover plates and without graduation 



60,207. - - idem, with graduation 



s, d. 

 0. 12. 



0. 6.0 

 0.15. 



1.10.0 



1.17.0 



i 



60,208. Liquid Resistance for the Electrometer Leaf 0. 1. 6 



60,209. - - idem, for the Electrometer Case 



60,210. Yarn for connecting the apparatus 



Electrometers for investigating Radio-active Substances: "see section on "Radio-Activity". 



Absolute Lecture Electrometer, as suggested by Prof. F. Braun (Tubingen), Figure (Wied. 

 Ann. 44, p. 771, 1891; Ztschr. f. d. phys. u. chem. U. 5, p. 61; W. and E., Fig. 252). 

 These electrometers can be used as a substitute for the aluminium leaf electroscopes. When a 

 lamp is placed behind them, the readings are visible at a great distance. 



The electrometers are supplied with the following ranges, and are carefully calibrated. 



List No. 60,211 

 Volts 01500 

 Graduated from 100 to 100 

 2.12.0 



60,215 



10,000 



500 to 500 Volts 

 3.6.0 



60.216. Extra Price if constructed with Mica Scale and figured for projection purposes . . 



60.217. Metal Beaker, with haft soldered on, for graduating the Braun Electrometer (M. 



T., p. 234) 



0. 2.6 



0. 1.0 



0. 6.0 



0. 3.0 



Cl. 3815, 2084. 



51* 



