The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 413
differ, as I believenone but linear drawings will ever give the necessary basis ofmeasurement. The annexed engraving is a representation of the instrument.A B C is the drawer or part moveable by the hand ; it is so constructed 51* 378 THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. [November, with… … drawer, ABC, keeps always parallel to itself; and, therefore, if apencil is placed at B, whatever A traces at one end is drawn exactlyat the other by that pencil. If A traces the contour A F, B draws thecontour at B L. When it is requisite to draw another contour thedrawing-board is screwed back…
Architecture · Civil engineering · Science
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