from this necessarily follows allthat is stated in rule 4. That common point mustbe where a line, drawn from the e3e of the spectator,parallel to the actual line in the object, would ter-minate ; for towards that, as may be easily shownby drawing on a transparent vertical plane as al-ready… … 256 TEACHERS MANUAL. read\ been said of this on pp. 91, 94, to which yonare referred. Divide a line ah into two equal parts, as shown in Fig. 1, cnt C.Suppose this lineto be viewed ob-liquely, with theeye at an infinitec distance, as in orthogi-aphic projection. The rays of light pro-ceeding from…
Drawing
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