228 



LETTERS ON NATURAL MAGIC. 



wires by four slender ribands b, 6, b, b, and into the 

 copper ball were fixed the extremities of four trumpets 

 T, T, T, T, with their mouths outwards. 



Fig. 37. 



The apparatus now described was all that was visible 

 to the spectator; and though fixed in one spot, yet it 

 had the appearance of a piece of separate machinery, 

 which might have occupied any other part of the room. 



When one of the spectators was requested by the exhibitor 

 to propose some question, he did it by speaking into one 

 of the trumpets at T. An appropriate answer was then 



