Engler — The Normal to the Conic Section. 



159 



for the original hyperbola but for the conjugate hyperbola as 

 well, as is shown in Fig. 13, in which the point P is so situated 



Figure 13. 



that there are two normals, PN~ 2 > PN Z , to the original hyper- 

 bola and two normals, PJST l9 PJST i9 to the conjugate hyperbola. 



Issued July 15, 1898. 



