No. 60300. 



Electrostatic Apparatus as suggested by Noack and Kolbe. 



811 



I I 



60 270. 1 : 30. 



60297. 1:10. 



60.286. Spherical Condenser, for external earthing, for determining the capacity of the electro- A. 

 meter (p. 31, Figs. 23 and 24) . 0. 12. 



60.287. --idem, for internal earthing (p. 32, Figs. 25 and 26) 0. 12. 



60.288. Pendulum Discharger, for measuring the electrometer capacity (pp. 35 38, Fig. 27) 0. 15. 



60.289. Double Spherical Condenser, for accurately determining the capacity of the electro- 

 meter (pp. 4041, Fig. 28) ' 1. 2. 



60.290. Plate Condenser, for measuring the dielectric constants and cumulative values of 

 condensers (pp. 42 45, Bigs. 29 and 30) 4. 5. 



60.291. High Tension Battery of 200 Daniell Cells, built in wood box for determining the cumu- 

 lative values of condensers and for calibrating the electrometer (pp. 48 51, Fig. 31) 3. 12. 



60.292. Simplified Absolute Cylindrical Electrometer, as suggested by E. Bichat and E. Blond- 

 lot (see also Journal de Physique, Series II, 5, p. 325, 1886), with case and protecting 



cylinder (pp. 5153, Fig. 32) 5.10.0 



60.293. Spark Micrometer, for determining spark potentials, with pillar adjustable in the 

 guides by means of micrometer screw (pp. 53 55, Fig. 33) 2. 8. 



60.294. idem, with pillar which, however, is adjusted scissor- wise by a joint (pp. 53 55, 



Fig. 34) 1. 7.0 



Electrostatic Apparatus as suggested by Bruno Kolbe. 



The figures in brackets refer, when not otherwise stated, to the corresponding numbers in the 

 book entitled: Kolbe - Skellon, Introduction to Electricity, I. Part, London, Kegan Paul, Treuch, 

 Triibner & Co., Ltd. 1908. 



60,161. Double Electrical Pendulum with two rotary arms, F i g. 60,161, p. 798 (Fig. 2) . . 0. 8. 

 60,175. Paper Electroscope, F i g. 60,175, p. 799 (Fig. 3), with nickelled fittings 0. 12. 



60.297. 2 Paper Electroscopes, Figure (Figs. 3, 4, 7, 22, 24, etc.), with nickelled fittings, 

 both balls having holes for inserting the point and the holder for the rods. The fol- 

 lowing are supplied as accessories: each 1 rod of flint glass, wood, ebonite, sealing wax 

 and fishbone of 350 mm length, 1 discharger (Fig. 24), 1 test ball with 10 metres fine 

 German Silver wire, 1 point bent at right angles (Fig. 22) and 2 holders for the rods 1. 8. 



The ball on glass pillar illustrated in the figure is not included in the price. 



60.298. Electric Pendulum with long arm and 2 balls of different colour (Fig. 5) .... | 0. 4. 



60.299. Electric Needle, as suggested by Gustav Wiedemann (Fig. 6), consisting of a light 

 ebonite tube with 1 glass and 1 ebonite disc at the ends, 1 wire bow with silk thread 



and 1 second ebonite tube with leather and catskin disc on wood board at the ends 0. 12. 

 For the same apparatus swinging on insulated stand with point, see No. 60,162, p. 798. 



60.300. Flexible Wire Netting, as suggested by Vanderfliet and Kolbe, for demonstrating 

 electric distribution, Figure (Figs. 9 and 10), with a number of movable paper 

 leaves and with 2 insulated stands 0. 12. 



When the wire netting in the charged state is bent, the paper leaves are more strongly repelled 

 on the external curved side, corresponding to the accumulation of electricity, while the leaves on 

 the inner side no longer show any repulsion. 



Cl. 2106, 2109. 



