Practical draughtsmen's work, with numerous engravings and diagrams (1903)
Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 88
rts, and draw vertical lines. Then for method 1 divide thevertical line at the extremity of the base into eight equal parts,the same number as in the semi-base, and from the vertex of theparabola draw lines radiating to these division points; theintersections with the vertical lines will give… … Fig. 142.—Throe Methods of Constructing Parabola. Method 2 is based upon the nature of the curve explainedabove, displacement at a distance of 1 being 1 squared 1^ =1 X 1 = 1; at a distance of 2 = 2^ = 2X2 = 4; at a distanceof 3 = 3^ = 3 X 3 = 9, and so on, so that if we had a totalheight of…
Mechanical drawing
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