Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 18
; the perpendicular lines should be drawn bythe set-squares. If this is done, it is immaterial whether theedges of the drawing-board are at right angles, because it willonly be necessary to use one of its edges. For drawing parallel lines that are neither horizontal norperpendicular, hold one… … Fig. 2. When a problem contains many arcs of circles, it is advisableto connect each arc with its corresponding centre. Enclose thecentre in a small circle ; draw a dotted line to the arc, termi-nated by an arrow-head (Fig. 3). In drawing intersecting arcs for bisecting lines, etc., the arcsshould…
Geometrical drawing · Design · Drawing
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