. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. xtendedbeyond the object; in which case such a section is called a projected perspective re-presentation of the object. 2407. It will then be seen that a knowledge of perspective is, as Addison has said, aknowledge of the science by which things are ranged in picture, according to their ap-pearance in their real situation. 240S. The situation of the objects being given with the plan and position of the plane ofdelineation and the height and distance
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. xtendedbeyond the object; in which case such a section is called a projected perspective re-presentation of the object. 2407. It will then be seen that a knowledge of perspective is, as Addison has said, aknowledge of the science by which things are ranged in picture, according to their ap-pearance in their real situation. 240S. The situation of the objects being given with the plan and position of the plane ofdelineation and the height and distance of the eye of the observer, the delineation of suchobjects is truly determinable by rule. The mechanical operations necessary for this pur-pose form the subject of what follows. It is however necessary, before proceeding to laythem before the reader, to premise that he must thoroughly study and understaiiff the pre-ceding definitions before he can proceed with profit to himself, and we recommend a repeatedperusal of them until that be effectually accomjilished. 2-109. Example I. In Jig. 830., No. 1., we have the plan of the original object. ET5ADCF, whereof ABCD is a cube, and RCEE a double cube, that is, twice the heightofC15.\D. GIj is the ])lau of the ground line ; S, the station point. Through S drawXY jiarallel to the ))iane of delineation G L, and draw SG and SL respectively jtarallei tothe sides EA and AD of the united cubes ABCl) and BtFE ; and these produced to meet S14 THEORY OI ARCHITECTUUE. Book II. the ])lane of (k-liiieatlon will determine the vaiiisliiiig iioints ( Def. 14.) of the horizontallines AE and AD, and of all other horizontal lines i)arallel to them. Draw tlie line SOperpendicular to GL, which line being the direction of the eye perpendicular to the planeof the picture determines tiie point thereon to which the eye should be directly opposite toview it when completed, showing also how much f the object is on one side, and how muchon tlie other of the p
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