Elements of plane and solid free-hand geometrical drawing, with lettering; and some elements of geometrical ornamental design, including the principals of harmonic angular ratios, etcIn three parts ..for draughtsmen and artisans; and teachers and students of industrial and mechanical drawing . Flo-.^aVl CUEYILmEAE GEOMETRIC BEATJTT. OVALS. 119 base db^ Figs. 29, 30, of the transformed triangle, must beshorter than the greatest width, 2 O C, or 2 S (g, of the axis, Ox Ji, of the oval, being thns brought nearer to O, the. -^-r- Fig. 9D. semi-circle A O B should be larger, to give an ova
Elements of plane and solid free-hand geometrical drawing, with lettering; and some elements of geometrical ornamental design, including the principals of harmonic angular ratios, etcIn three parts ..for draughtsmen and artisans; and teachers and students of industrial and mechanical drawing . Flo-.^aVl CUEYILmEAE GEOMETRIC BEATJTT. OVALS. 119 base db^ Figs. 29, 30, of the transformed triangle, must beshorter than the greatest width, 2 O C, or 2 S (g, of the axis, Ox Ji, of the oval, being thns brought nearer to O, the. -^-r- Fig. 9D. semi-circle A O B should be larger, to give an oval ol thedesired size. 83. Only half ovals are shown, in order to avoid confusing 120 FKEE-HAND GEOMETEICAL DEAWING. the figures. They will exhibit themselves better by completingthem ; the two halves on each side of ay ^i, or «2 Jg, being justalike in all the figures. With these explanations and illustrations, pupils and practi-cal designers will be put in possession of the means of con-structing ovals of every possible variety of form, and basedupon definite angular relations. Any oval can then, if desired, be enlarged or diminished ins^s6, without altering itsy^rm, and without the labor of entirelyreconstructing it, by either of the methods explained in PartL, PI. II., Figs. 7, 8, 9.* Industrial Applications. 84. The industrial aj^jplications of the ovals now described,both to objects of utility and beauty, are so numerous that, forwant of space, we can only name some of them, in connectionwith the principles governin
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmechanicaldrawing
