70 INVtS^IBLE (SIRI. 



vi>ib!e being, as the voice apparently proceeds from tlie irv- 

 terior ot it; and for this purpose it is equipped with the 

 mouths of four trumpets, placed round .it in an horizontal 



snd the direction, and at right angles to each other, as may be 



sounds seem more distinctly seen at fig. 2, where^ is the globe, dddd 

 from°the^trum- ^^^ trumpets, and bb bb the frame surrounding them, being 

 pets. about half an inch from them. When a question is pro- 



posed, it is asked from any side of the frame, and spoken 

 into one of the trumpets, and an answer immediately pro- 

 ceeds from all the trumpets, so loud as to be distinctly heard 

 by an ear addressed to any of them, and yet so distant and 

 feeble, that it appears as if coming from a very diminutive 

 being. In this the whole of the experiment consists, and 

 the variations are, that the answer may be returned in several 

 languages, a kiss will be returned, the breath, while speaking, 

 may be felt, and songs are sung either accompanied by the 

 piano forte, &c. 

 But the sound After describing the manner in which this effect is brought 

 " '^^d^b^ ^°"' ^^^^^> '*^ "^'^^ immediately appear that the whole deception 

 tube. consists in a very trifling addition to the old and well-known 



mechanism of the Speaking Bust, which consists of a tube 

 from the mouth of a bust, leading to a confederate in an 

 adjoining room, and another tube to the same place, ending 

 in the ear of the figure- By the last of these, a sound whis- 

 pered to the ear of the bust is immediately carried to the 

 confederate, who instantly returns an answer by the othjsr 

 tube, ending in the mouth of the figure, who seems to 

 utter it: and the Invisible Girl only differs in this one dr- 

 cumstance, that an artificial echo is produced by means of 

 the trumpets ; and thus the sound no longer appears to pro- 

 ceed in its original direction, but it is completely reversed. 

 The apparatus necessary to produce this effect, is seen in 

 Description of fig. 3, where bh represent two of the legs of (he frame, one of 

 the tube and vvhich, as well as half the hand-rail, is made into a tube, the 

 tus. ^^'^ o^ which opens in the rail immediately opposite the 



center of the trumpet. Tiiis hole is very small, and con- 

 cealed by reeds or other mouldings, and the other end com- 

 municates by a long tin half-inch pipe, pp, concealed under 

 the boards of the floor, //, and passing, concealed, up the 

 wall of the room to a large deal case, k, almost similar to an 

 inverted funnel, large enough to contain the confederate. 



