Burn, Robert Scott · London : Ingram, Cooke, and Co. · leaf 79
to the hand in drawing circles ; but for circles of very largedimensions, the principle may be extended, and twice the number of pointseasily found by doubling the number of cross-lines, 2 8, 4 6. The last figure gives the perspective circle in a horizontal plane ; thesame rule applies to its… … ful in drawing bridges and viaducts with semicircular arches, an exampleis given, with a description of the process. The arches in the annexedviaduct being semicircular, the upper part only of the circle is to besquared by diagonals, diameters, and cross-line, as in fig. 36, by whichmeans five…
Drawing · Wood-engraving
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