PERSPECTIVE. 387 



To lay down the widths of the doors and windows, 

 put their actual widths upon C E, and draw from 

 them to the distance-point I, which cuts off all 

 divisions upon the side L E, and then raise the per- 

 pendiculars. The gable-end is found exactly in 

 the same manner as was described in PI. 6. only 

 taking care to use the proper distance-point H. 

 The manner of finding the width of the chimney is 

 different. Lay off b a for the height of the chimney 

 above the top of the gable, and draw a c parallel to 

 the horizontal line ; then put a c equal to the actual 

 thickness of the chimney, and draw a d to the 

 vanishing point A ; draw also c d to the distance- 

 point I, cutting oW admd : then having drawn ef 

 from the nearest corner of the chimney, which 

 was found as in PI. 6. Fig. 1. Draw df to the 

 vanishing point B, cutting o^ efi'oi' the exact per- 

 spective width. 



Fig. 2. represents the method of finding the per- 

 spective of a circle in oblique perspective. A B is 

 the horizontal line, C the centre of the picture, and 

 D, E, the distance-points. The process is exactly 

 the same as that just described, the several divi- 

 sions of the reticulated square in PI. 6. Fig. 3. 

 being laid upon the ground-line FG, and from these 

 lines are drawn to the distance-points. The per- 

 spective of the square is then drawn with all the 

 lines across it, and the curve traced through the 

 different points. 



By drawing these examples frequently over, to 

 large scale, and reflecting upon them with atten- 

 tion, the student will become familiar with their 

 use J and as they include the cases which most fre- 

 quently occur, he will find great benefit from the 

 knowledge of them. 



c c 2 



