CYLINDRICAL MIRRORS, 



93 



been a deformed or anamorphous drawing, in 

 order to give a reflected image of just propor- 

 tions. We doubt, indeed, if the representation 

 or the figure was ever exhibited. It is entirely 

 incompatible with the laws of reflexion. 



Among the ingenious and beautiful deceptions 

 of the 17th century, we must enumerate that of 

 the re-formation of distorted pictures by reflexion 



Fig. 11. 



from cylindrical and conical mirrors. In these 

 representations, the original image from which a 

 perfect picture is produced is often so completely 



