812 



Electrostatic Apparatus. 



No. 60:ii'l 



60301. 1 : 10. 



60307. 1:10. 



60316. 1:12. 



60,301. Soap Bubble Apparatus, for proving electrical density, Figure (Fig. 12), with test 



electroscope and rubber bulbs 0. 12. o 



If the soap bubble is blown up, the leaves of the electroscope collapse proportionally to the 

 slight electric density on the larger surface of the soap bubble. 



60.196. Aluminium Electrometer, F i g. 60,196, p. 802 (Fig. 15), with calibrated pro- 

 jection scale and amber tube in ebonite plug, 1 ball 10 mm diameter, 2 condenser plates 

 (varnished) with 1 ebonite handle, 1 extra ebonite plug with amber tube, conducting 



rod and paper leaves 3. 0. 



The sheet iron case is 130 mm high, 140 mm wide and 95 mm deep. 



Accessories for Aluminium Electrometer. 



60.197. Projection Degree Scale for inserting, divided on mica 0. 6. 



60.198. 2 Pieces Sheet Iron for inserting, with C-shaped pieces cut out, for quantitative ex- 

 periments 0. -1. 



60.199. Hollow Ball for screwing on, 50 mm diameter, and 2 Insulated Test Balls for graduating 0. <;. <> 



60.306. Brass Rod with 2 Balls, nickelled (Fig. 26 a) ... 1 0.1.0 



For Kolbe Projection Apparatus: see Vol. I of this Price List, p. 167, Nos. 50,855 50,866. 



60.307. Conical Conductor, Figure (Fig. 14), for proving the different distribution of 

 electricity on the surface of an insulated conductor, nickelled, with 3 test balls of 15, 



10 and 5 mm, on ebonite hafts 1. o. > 



60.200. Test Electroscope, F i g. 60,200 on p. 802 (Fig. 17) 0. >. u 



60.309. Wire Net Cylinder with sheet iron bottom, for screwing on the electrometer (Fig. 20) o. 3. o 



60.310. Ebonite Rod with amalgamed leather rubber (Fig. 20) 0. 2. 



60.311. 4 Nickelled Hollow Balls of 20, 10, 10 and 5 cm diameter on insulating stands (Fig. 22), 



for experiments on electric density with equal charge 2. (i. <> 



If Ball No. 60,199 is already available, this can be omitted, and the price it then reduced to 

 1. 16. 0. 



60,183. Aluminium Electroscope with degree scale, Fig. 60,183 on p. 800 (Fig. 26 B) . . 0. is. o 



<iO,3L3. Glass Plate for the screening effect of electricity (Fig. 27) 0. 1.6 



60,314. Ebonite Plate for the same (Fig. 27) 0. 3. 



60,3.1 r>. White Metal Sheet Plate for the same (Fig. 27) 0. l.o 



60.316. Wire Net Cylinder and Sheet Iron Plate, Figure (Fig. 28), for showing that elec- 

 tricity resides only on the surface 0.10.0 



60.317. Candle Holder with wire net for placing on same (Fig. 29) 0. .">. o 



60,221. Pendulum Electrometer (Odstreil's), simple construction (Fig. 30), sec Fig. 60,221 



on p. 804 I. 0.0 



60,319. 1 Pair Air Condenser Plates (Fig. 34), 15 cm diameter, polished quite plane, nickclled. 



with ebonite handle, on insulating stand and with 1 mica plate lit cm diameter . . 1. 8. u 



CI. 2111, 2114, 2116. 



