Constructive drawing. A text-book for home instruction, high schools, manual training schools, technical schools and universities (1904)
Hanstein, Herman. [from old catalog] · Chicago, New York [etc.] Keuffel & Esser co. · leaf 64
r-i—/1 / / 1/ ^XT| i !./f X\) / ^vii f ^^ fffmsUlns Constructive Drawing. 127.—Fig. 1.—Problem.—To construct hyperbolaswhen the vertices and foci are given. Definition.—The hyperbolas are curves; the dif-ference of distances of each point to the foci isequal to an invariable line, the axis.…
Mechanical drawing
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