The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 411
that thevarious parts may occupy their just positions, or that the drawingand paper receiving the copy may be accurately shifted. Although it may be evident that the lines and curves traced byany two of the points B, D, C, which are in motion simultaneously,are precisely similar, the consideration… … LetAa = Dc=ri; aD=Ac=c; cC=c; andaB=l.Also, su](posing the fulcrum at D, take this as the origin of co-ordinates, the axes being DX. DY, and B, D, C, being always inthe same straight line; then the co-ordinates will be expressed asfollows:— X, y, for the point C x, y\ for the point c x, y, for the…
Architecture · Civil engineering · Science
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