PERSPECTIVE* 381 



and make C I equal to the width of the house. 

 From G, the centre of the picture, lay off G K 

 equal to the distance of the picture, the choosing 

 of which must be regulated by taste. Draw I K, 

 cutting C G in F ; then is C F the exact width of 

 the house in perspective, which was equal to C I. 

 To find the middle of this end of the house, you 

 cannot divide it by your compasses, because the 

 farthest half will appear less than the nearer ; but 

 if you divide C I into two equal parts in L, and 

 draw L K, it will cut C F into two equal parts per- 

 spectively. Or it may be found more simply thus : 

 Having drawn the lines B E and C F to the centre 

 of the picture, draw the diagonals E C, B F cross- 

 ing each other in M, and raise the perpendicular 

 M N, which is in the middle of the gable-end. 



To find the height of the gable, lay its actual 

 height above B E, upon the corner line B C con- 

 tinued, as B O, and draw O G ; this crossing the 

 perpendicular M N, gives N the point of the gable. 

 The top of the chimney must be drawn in the same 

 manner, by laying its real height, taken from a 

 scale on O P, and drawing P G, lay off L m and 

 L 71, each equal to half the width, and draw from 

 these points to the distance point k ; this will cut 

 the bottom of the house C F, in the points o and^? ; 

 from these draw perpendiculars, which will give 

 the perspective width of the chimney. To obtain its 

 thickness, lay off P Q equal to its thickness, and 

 draw Q G ; then drawing from a the line a b, you 

 obtain the exact width of the chimney. From b 

 draw b c, and from d draw d c. The other end of 

 the gable may be drawn by two different methods. 

 The first is by supposing the front of the house 

 transparent, and drawing the other end as if seen 

 through it, in the same manner as the end we have 



