822 



Static Electricity. 



\.l 



60471. 1:8. 



Accessories for Franklinization. 



s. -d. 



60.463. Rubber Slab, 70x100 cm, 3 mm thick, Figure (p. 820) 1. 4. 



This slab, of soft rubber, is used in connection with the metal coating listed under No. 60.464 

 instead of the insulating stool. 



60.464. Metal Coating, 50x80 cm, for preceding rubber slab, Figure (p. 820) .... 0. :.. n 



This metal covering consists of a 0.5 mm thick nickelled zinc sheet with a plug-box. 



60.465. 2 Connecting Leads, thickly insulated with rubber, with spring-hook, Figure (p. 820) 0. 12. 



60.466. Globe on Insulated Stand, Figure (p. 820) 1.10.0 



The device can be raised and lowered as well as rotated laterally. 



60.467. Franklin Electrode Holder, 50 cm long, with terminal, Figure (p. 820) .... 0. 6. 



60.468. Brass Sphere, for screwing on the electrode holder, Figure (p. 820) 0. 1. 6 



. 



60.469. Franklin's Rose, for screwing on the electrode holder, Figure (p. 820) .... 0. lo. d 



The rose is 13 cm in diameter, being provided with a number of metal points covered \vitli 

 ebonite sleeves. 



60,470. Influence Machine, as suggested by Weinhold, Figure on p. 821, plate diameter 



45 cm (W. D. Fig. 453 [430]), without alternation, not self excited, with iron frame 5.10.0 



1 



New High-Capacity Influence Machines. 



60,471. Self-Exciting Influence Machine, as suggested by Wommelsdorf, Figure, with 

 sectors embedded on all sides (Ann. d. Phys., 4 th Series, Vol. 23, 1907, p. 609), for hand 

 and motor drive, with plates 35 cm in diameter; spark length: 130 175 mm, current 



to 90 micro-amperes 13. lo. o 



The machines are of very high efficiency and work exceedingly w( .n. They are only constructed 

 with simple rotation and the sectors are completely embedded in ebonite discs. 



Cl. 4948. 





