87
XL. How to Ascertain the Relative Heights of Figures
on an Inclined Plane 88
XLI. How to Find the Distance of a Given Figure
or Point from the Base Line 89
XLII. How to Measure the Height of Figures
on Uneven Ground 90
XLIII. Further Illustration of the Size of Figures
at Different Distances and on Uneven Ground 91
XLIV. Figures on a Descending Plane 92
XLV. Further Illustration of the Descending Plane 95
XLVI. Further Illustration of Uneven Ground 95
XLVII. The Picture Standing on the Ground 96
XLVIII. The Picture on a Height 97

BOOK III

XLIX. Angular Perspective 98
L. How to put a Given Point into Perspective 99
LI. A Perspective Point being given, Find its
Position on the Geometrical Plane 100
LII. How to put a Given Line into Perspective 101
LIII. To Find the Length of a Given Perspective Line 102
LIV. To Find these Points when the Distance-Point
is Inaccessible 103
LV. How to put a Given Triangle or other
Rectilineal Figure into Perspective 104
LVI. How to put a Given Square into Angular
Perspective 105
LVII. Of Measuring Points 106
LVIII. How to Divide any Given Straight Line into Equal
or Proportionate Parts 107
LIX. How to Divide a Diagonal Vanishing Line into any
Number of Equal or Proportional Parts 107
LX. Further Use of the Measuring Point O 110
LXI. Further Use of the Measuring Point O 110
LXII. Another Method of Angular Perspective, being that
Adopted in our Art Schools 112
LXIII. Two Methods of Angular Perspective in one Figure 115
LXIV. To Draw a Cube, the Points being Given 115
LXV. Amplification of the Cube Applied to Drawing
a Cottage 116
LXVI. How to Draw an Interior at an Angle 117
LXVII. How to C