, or any other required points, is said to be divided “IN PERSPECTIVE RATIO” to the divisions of the original line A D.

If the line

a

V is above the sight-line instead of beneath it, the measuring-line is to be drawn above also: and the lines

b′

M,

c′

M, etc., drawn down to the dividing-point. Turn [Fig. 17.] upside down, and it will show the construction.

[p27]
][PROBLEM VI.]

TO DRAW ANY TRIANGLE, GIVEN IN POSITION AND MAGNITUDE, IN A HORIZONTAL PLANE.