Caption: Mathematical Models by Arnold Emch  Series 3 (1925) This is a reducedresolution page image for fast online browsing.
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t he cubic m a y be put in the form ^  1 4 1 , ice  1) 2k 1 ! 2(y I, I which shows thar the circles o n rhc cubic arrange themselves into couples of equal circles \2 values o! z) such thai their projections o n the zplane are equal Fig 4 T h e intersection of rhe iplane with rhe cubic is the hyperbola 2z  v: 4 v   ;= O , with the asymptotes c  1 and : = l<2.i  ]c?; , .and the line x = L In both, models the circular sections are represented b y a l u m i n u m disks. T h e y are also reproduced b y plastercasts. Fig. 5 [10]
