420 



NEGRETTI AND ZAMBBA, HOLBOEN VIADUCT, B.C., 



FIG. 2438. 



FIG. 2440. 



FIG. 2441. 



FIG. 2445. 



Each. 

 s. d 



Each. 

 s. c 



086 16 

 15 



066 



14 



2431 Names or Words, arranged upon glass, with pieces of 



tin foil, which may be rendered luminous in the dark 



by the agency of electricity (fig. 2431) . 7s. 6d. 10 6 150 



2432 Star, formed of spangles of tin foil, on a flat glass 



(fig. 2432) from 056 



2433 Bird, formed of spangles of tin foil, on a flat glass from 056 



2434 Painted Glass Plane, on Stand, in different colours, with 



devices of tin foil, for showing the electric light 

 (fig. 2434) 



2435 Lightning Plate De Londe's is constructed of a plate of glass 



mounted upon a firm base; one side of the glass is entirely 

 coated with tin foil to within a short distance of its edge, and the 

 opposite side is covered with small spangles of tin foil placed at 

 a short distance from each other. This form s a modified Ley den 

 jar : when charging the plate, the electricity darts about its 

 surface in all directions, and when discharged a brilliant display 

 of electric light is produced 110 220 



2436 Iron Chain, for illuminating a darkened room by 



electricity per yard 006 



2437 Diamond Spotted Jars, showing a beautiful light when 



discharged in a dark room (fig. 2437) . . 8s. 6d. 15 1 10 



2438 Egg Stand, for exhibiting eggs, &c., rendered luminous 



during the passage of electricity (fig. 2438) 



2439 Faraday's Improved Egg-Stand, with Glass Cylinder . 



2440 Image Plates, brass stand with hook, to connect to 



prime conductor, for pith figures, illustrating electrical 

 attraction and repulsion (fig. 2440) .... 



2441 Image Plates, with insulated glass support for the upper 



plate, connection being made from the prime conduc- 

 tor, the figures are removed from the attractive 

 influence of the cylinder (tig. 2441) .... 



12 6 



15 18 6 



