No. 60 710. 



Voltaic Piles, Electrometers. 



841 



60 708. 



60 705. 



60 709. 1 : 4. 



60 710. 1 : 6. 



60,705. Electrometer (HankePs) (M. P. 10 th edn., IV, 1, Fig. 257), Figure, amber-insulated 



60,258. Water-Battery for charging Quadrant Electrometers and the Hankel Electrometer, 

 Figure 60,258 on p. 808, 144 copper-zinc cells on ebonite stand (W. D. p. 759 [700]) 



60.707. Water Battery (Rowland's), 400 cells (Ztschr. f. d. phys. u. chem. U. 1, p. 120; W. 



D. p. 760) 



60.708. Electrometer with Quartz Fibres and microscopic reading, as suggested by Prof. 



E. Wichert, Figure, very sensitive and provided with excellent insulation. In case 



60,709. Discharge Electrometer (Weinhold's), Figure (W. D., Fig. 506 [479]) 



60,710. Quadrant Electrometer (Thomson-Mascart's), Figure (M. P. 10 th edn., IV, 1, 

 Fig. 253; 9 th edn., Ill, Fig. 180), without replenisher, with adjustable bifilar suspension, 

 closed by metal cylinder, Maxwell vane, quadrants heavily gilt, excellent amber- 

 insulation . 



s. d. 

 9. 10. 



3. 0.0 

 3. 5.0 



9.10.0 

 1. 7.0 



11. 0. 



Cl. 5688, 5691, 

 2204, 4094. 



