THE KALEIDOSCOPE. 



placed at an angle of 45, and are reflected downwards vertically 

 to the mirror h, also placed at 45, from which they are reflected 

 horizontally to the mirror g placed at 45, from which they are 

 again reflected vertically to the mirror k placed at 45, from which 

 they are reflected horizontally to the eye at A. The eye thus sees 

 the object after four reflections, the rays which render it visible 

 having travelled round the rectangular tube I h g k. 



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