4">, OOiiXllSLL, K.C., AND 122, KEGENT STEEET, W., LONDON. 



453 



FiG. 2745. 



2752 Gassiot's Revolving Star, best form .... 550 



This apparatus is an adaptation of Sturgeon's Revolving Electrical Spiral. 

 Attached to the axis of the machine is a piece of varnished wood or vulcanite, 

 fitted at each end with metallic spring clips for holding securely the vacuum 

 tube to be revolved. Two fine insulated wires in connection with the metal 

 clips and terminal wires of the vacuum tube are carried down the back of 

 the wood arm to the axis, and are in metallic connection with two binding 

 screws on the base of the apparatus by which the induction coil is to be 

 placed in contact. The connections having been carefully made, the tube is 

 caused to be very rapidly revolved by the action of the large wheel on a 

 small one placed at the axis, and the result is a beautifully iridescent star, 

 the colours. &c., varying with the form of the tube employed. 



2754 Vacuum Tubes for Medical use, illuminating the Throat, Ear, &c., various 



forms and prices, supplied to order. 



2755 Incandescent Lamps, 2|, 5, 10, 20 C. P. . each 



2756 Ditto ditto, for Microscopic use 



2757 Holders, for ditto 



2758 Ditto with Bracket Clip 



2759 Miniature Lamps for Scarf Pins, &c. . . each 



2760 Portable Accumulator, containing 3 Ebonite Cells, 



weight about 2 Ibs. ....... 



2761 Ditto ditto with Lamp and Comb to wear in the 



hair 



2762 Apparatus for exhibiting the Luminous Electric 



discharge in vacuo, (Aurora Borealis) (fig. 2762) from 

 Carbon Points on Metal Terminals, sometimes called 

 the Electrical Egg 330 



s. 



6 

 5 



2 



4 



10 



200 



330 



