. The Architectural magazine. projected as a right-angled parallelogram, only one 212 Perspective. 100 / other face can be seen, which will also be a right-angled pa-rallelogram. Let abed {Jig. 100.) be the plan of a cube, and c/the plane of projection: a h mustbe parallel to ef beforeit can be of the samelength in the projectedrepresentation as it is ingeometrical plan. Asthe rays must be per-pendicular to the plane,they will be parallel toa c and h d; conse-quently, neither of thefaces a c or b d can beseen in the one face, as in^*, or two faces, / andVI, as in^^. 102.,
. The Architectural magazine. projected as a right-angled parallelogram, only one 212 Perspective. 100 / other face can be seen, which will also be a right-angled pa-rallelogram. Let abed {Jig. 100.) be the plan of a cube, and c/the plane of projection: a h mustbe parallel to ef beforeit can be of the samelength in the projectedrepresentation as it is ingeometrical plan. Asthe rays must be per-pendicular to the plane,they will be parallel toa c and h d; conse-quently, neither of thefaces a c or b d can beseen in the one face, as in^*, or two faces, / andVI, as in^^. 102., can beseen; and the length a n, or h o, in the latter figure, will bearthe same proportion to a b that the hypotenuse does to the sideof a square. The faces I and m need not be represented equal,101 but in proportion as the one n 102 o is increased the other isdiminished; but if a i andh k are made the samelength as a Z>, the surface ofthe face I must then be pa- .rallel to the surface of the plane, and its representation. V \/^
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Keywords: ., bookcentury1800, bookdecad, booksubjectarchitecture, bookyear1834
