, / 
WHITELAW’S PAPER ON PERSPECTIVE DRAWING. 139 
PERSPECTIVE MADE EASY, 
Siiv-^The follovmig paper on Perspee- 
iive Drawing is intended to be useful to 
those readers of your Magazine who want 
infoi’mation on that subject, and who are 
not mathematicians enough to understand 
the ordinary treatises. By giving it a place 
in the Mechanics’ Magazine, you will very 
much oblige. 
Yours truly, 
James Whitelaw. 
Glasgow, July 27, 1835. ^ 
1. If a person behind a transparent plane 
kept his eye exactly in the same position 
till he traced on the plane the objects on 
the other side of it, by means of a pencil 
carried over the parts of the plane, where 
the rays of light reflected to the eye from 
all the lines in the objects cut the plane, 
the delineation would be a perspective draw- 
ing of the objects. 
2. Fig. 1 is a ground plan of a number of 
objects, marked A B C D, standing on a 
