The Principles of Architectural Perspective by George Alexander Thomas Middleton

Author:George Alexander Thomas Middleton
Language: eng
Format: epub
Publisher: Patavium Publishing
Published: 2023-04-20T00:00:00+00:00

N is now joined to L, fixing in perspective the line of the ridge S, and meeting the vertical from T at O.

The Ground Line, being unnecessary if this method of working be adopted, as was explained with reference to Fig. 15, has been dispensed with.

This process of tracing each point along various planes and lines appears to be a very slow and tedious one when followed in this way step by step, but in practice it is rapid enough, as after a little experience the various lines are put in almost automatically, and very few of them indeed are drawn along more than a small proportion of their full length. The points L and R, also, are not represented by mere dots, but by strong needles driven firmly into the drawing board, round which a straight-edge will work with ease, a T-square being generally used for lines radiating to L. The T-square used should not be long enough to reach to R. Thus, unless either L or R be situated beyond the limits of the drawing board, necessitating the use of a centrolinead, the instruments needed are a T-square, straight-edge (the straight portion of the centrolinead will suffice) and set-squares.

The perspective outline of the single-storey bungalow shown in Fig. 28 has been worked out in a precisely similar manner to that of the house in Fig. 27, with the important exception of the heights. These, for points in the main frontages, have been determined as described in relation to Fig. 26, but for all others a new method has been used, utilising the Ground Line. Take, for example, the roof apex lettered K both on plan and elevation. By convergence on plan to A, this is located at k on the Picture Plane, and is consequently known to lie in the vertical dotted line dropped from k. Another line is drawn through K on plan, parallel to the lines which have their Vanishing Point at L, meeting the Picture Plane at k1 This is projected vertically downwards till it meets the Ground Line at k2, when the height of K above the ground on the elevation is set up from k2 to K1. If K1 be joined to L, the vertical line dropped from k is met at K2, which is the point required.

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