Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 325
Fig.\ 766. X- J/2 z2 The Hypefbjloid of one sheet, —.-{-- -;; = 7, a- b- c^ … The Hiiperboloid of two sheets, ~ — ^- — ~= 1.a^ b- e2 SUKFACES OF REVOLUTION 309
Geometry, Analytic
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