WIZARD'S MIRRORS. 



307 



cavity, and a wreath, &c., arranged as in the previous experiment. 

 Obviously, nothing but the head of the performer (or whatever 

 portion projects upwards through the cavity) can be seen by a 

 spectator at P in front; whilst, if the wall papering of the 

 sides of the cabinet above the level of the edges of the mirror 

 and of the roof of the same are properly arranged, a reflection 

 of them will be seen in the inclined mirror, giving the impres- 

 sion that the flooring and walls are visible beloio the level of 

 the head, and hence making it appear 

 that the head is suspended in mid 

 air without any body being attached. 

 Thus the observer at P sees at E and F 

 respectively the reflections of the points 

 C and H, formed by the rays CD and 

 HG being reflected at D and G. 



Expt. 342. Wizard's Mirrors. If 

 two flat mirrors be arranged, suitably 

 situated with reference to one another, 

 a ray of light, emanating from some 

 bright object in front of one may be 

 reflected therefrom to the surface of the Fl ^ 148 ' Ma S lc MuTOrs ' 

 second, and thence reflected a second time to an observer's eye. 

 Thus, if two mirrors, AB and BC, be arranged at right angles, as 

 indicated by fig. 

 148, an observer 

 at P will see the 

 reflection of the 

 object at EF as 

 though it were 

 situated at GH ; 

 whilst the actual 

 object is hidden 

 from him by the 

 screen, K. 



A highly effec- 

 tive drawingroom 

 illusion may be 

 arranged after this 

 fashion by means 

 of two large look- 

 ing glasses ; pre- M ic Mirrorg> 

 ferably the one 



looked into should be supported on its side so as to swing on a 

 vertical axis. By the aid of a screen and properly arranged lights, 



