836 



Static Electricity. 



Nil. 60634 



60 634. 1 : 6. 



60 635. 1 : 8. 



60640. 1 : 10. 



60637. 1:16. 



60 639. 



B. a. 



8.0 



60.634. House with Tower and Lightning Conductor, Figure 2. 



A small vessel, containing spirit, is placed in the tower and the sheet iron vessel placed in the 

 house is filled with a mixture of house gas and airi and well corked. A charged Leyden Jar is 

 placed in the neighbourhood of the sphere of the lightning conductor and discharged. The spirit- and 

 the gas-mixture are then ignited; the former commences to burn and the latter forces the stopper 

 out with a bang; the roof of the house is forced out and the walls collapse. 



60.635. Aluminium Leaf Electroscope, as suggested by Saussure, for Atmospheric Electricity, 

 Figure, with ivory scale and brass conducting rod, 70 cm higli ; the base can be 

 detached (Gan.-Man. Fig. 871; Gan.-Eein. Fig. 1043) 1. 10. o 



Portable Electrometer and Flame Collector, as suggested by Exner : see Nos. 60,191 and 60,191 a 

 on p. 801. 



Electrometer for Atmospheric Electricity, as suggested by Bruno Kolbe: see No. 60,338 on 

 p. 814. 



60.637. Leyden Jar (Lodge's), Figure, with elder pith pendulums on both coatings (Lot! in . 

 Neueste Anschauungen iiber Elektrizitat [Modern Views of Electricity], German by 

 Wachsnnith, Leipzig, 1896, Fig. 9 d) 1. o. o 



60.638. Hydraulic Model of a Lodge Leyden Jar, Figure (loo. cit. Fig. 12) 4. 0. o 



By the aid of this model all phenomena attendant on the charging and discharging of Leyden 

 .lars and the analogous mechanical actions can be clearly explained. A rubber bellows represents the 

 dielectric, and the inner space of the rubber bellows, which is tilled with water, corresponds to the 

 internal coating, while the intermediate space between the rubber bellows and the glass bulb visible 

 in the illustration (which, as well as the entire apparatus, is filled with water) represents the. outer 

 coating. The two elder pith pendulums of Apparatus No. (in.ti.'JT are represented by pressure gauges 

 and the source of electricity by a water pump. . [_"; ^ 



60.639. Apparatus for showing Electric Constriction (change of volume of a l.rvilrii ,Iar when 

 charged), as suggested by IMitor, Figure (Fr. phys. Teohn. II, 1, p. 100) .... 1. .">.<> 



The internal coating is represented by the liquid in A. and the outer coating by the liquid be- 

 tween A and B. The two conducting liquids in Aa and lib are electrified by opposite kinds of electri- 



CI 4IMIS, 1MIII 'il: 



