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Caption: Mathematical Models by Arnold Emch - Series 4 (1928)
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B. T H E O R Y O F CUBICS LANTERN SLIDES FOR SCREEN-PROJECTIONS 34. Dual Singularities. The Cs with node at D is a T4 of class 4. T o the tangents of T4 correspond in the polar correlation with respect to the circle C (center 0) the points of a d. T o the double-point D {a, b) corresponds the double tangent d (A, B ) \ to the inflexion I ( ) the cusp / i (F), Fig. 11. Fig. 11 20
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