Industrial drawing and geometry; an introduction to various branches of technical drawing (1911)
Spooner, Henry John, 1856- · London, New York [etc.] Longmans, Green, and co. · leaf 81
about two axes of symmetry at right angles. You may have often seen pieces of paper folded, and cut with thescissors, which when opened out present very pleasing symmetrical figures. Fig. 193 shows a piece of foolscap paper, and MN is thefolded edge. The folded sheet is cut along the lines MCN to… … Pig. 193. Fig. 194.—Axis of symmetry.
Mechanical drawing · Geometrical drawing
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