Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 68
agrajjli is used for the copyiug of drawings, either on the samescale, on a reduced scale, or on an enlarged scale. Fig. 152 shows its simplest form and its application. The lower left-handpoint, around which the frame is turned, is fixed, and the proportion of thedrawing is determined by the… … Fig. 153. former. The free ends of the smaller set are jointed to the larger at about thecentre. Casters are placed at a <2, etc., to support the instrument and to allowan easy movement. DRAWING-PAPERS. Papers adapted to drawing may be obtained of various qualities, thicknesses,and dimensions,…
Mechanical drawing
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