INVISIBLE GIRL. Qg 



VII. 



77ie Invhibh Lady ; bei7ig ati Explanation of the Manner in what 

 the Experiment which wai exhibited i?i London, by M. Charles 

 and others, %:> performed. In a Letter from a. Correspondent. 



The experi- 

 S (he acoustic experiment of the Invisible Girl, which mcnt of the 



has excited so much attention and curiosity, does not appear invisible Girl 

 ^ , , ,.. , , . , . "^ , .. . T 1 has not yet 



to nave been hitherto explained m any publication, i have been publish- 



sent you the following drawing and description of the manner cd. 

 in which it is performed. I must, however, in justice ob- 

 serve, that the conduct of this experiment has been kept in 

 the most profound secrecy by the exhibitors, and that my in- 

 formation was obtained from the account given of it by Mr ^^ ^^s ex- 

 Millington, in one of his philosophical lectures, last winter, ^r. MHiiiigton 

 in Chancery-lane; where I witnessed the experiment in its in his lectures. 

 full effect ; and by a comparison of his account with the ex- 

 hibition which I have since visited, and find perfectly to 

 agree with his description, I am fully convinced they are 

 one and the same thing. If therefore you think the account 

 I send you worthy of insertion in your valuable Journal, it is 

 quite at your service, and it may perhaps afford information, 

 and gratify the curiosity of some of your readers. 



I am. Sir, your's, &c. 



X. 



Fig. 1, plate 2, represents a perspective view of all the The apparatus 



visible apparatus of the Invisible Girl as you enter the room. <^»nsis/.s "f four 

 f^^ •' _ metaihc trum- 



It consists of a mahogany frame, not very unhke a bed- pets connected 

 stead, having four upright posts a a a a, about fiv^e feet ?^"'^ ^" hollow 

 high, at the corners, which are united by a cross rail near 

 the top, b b, and two or more cross rails near the bottom, to 

 strengthen the frame : these are about four feat in length. 

 The frame thus constructed stands upon the floor, and from 

 each top of the four piliars a a ajci spring four strong bent 

 brass wires, converging at the top c, where they are secured 

 by a crow^n and other ornaments. From these four wires a 

 hollow copper ball, of a foot in diameter, is suspended by 

 slight ribbons so as to cut off all possible communication 

 with the frame. This globe is supposed to contain the in- 



F 3 



