London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 441
e, or, in revolvingthe view horizontally, the transverse directions of the plane. With this in-strument there will be always 30° in all directions about the point of sight, oraxis of vision. No object will project itself through this natural medium withthe double convergence exemplified by Kata… … situation produces it in the eye, isshown in the following diagram. Leta bcd,figA6l.,be a large semi-cylinder.Conceive a person standing oppositeto the middle, with the eye below itscentre. In seeing, or representing whatis seen, the perpendicular in the axisof vision, or direct view, will…
Architecture
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