Part 52

=Light=, and Sense of Seeing 254 Experiment with, illus. 255 Laws of 252

=Line=, def. 82 To Divide into Equal Parts 89

=Linear Perspective Drawing= 247

=Lines=, def. 45 Note 65 Parallel, def. 83

=Link Motion=, Stephenson’s, illus. 225

=Longitudinal=, def. 46

=Lucas, Theo.=, Acknowledgement 23, 266

=Marking Measurements= on Drawings 243

=Mechanical Drawing= 137, 247 Elevation 138 Examples 143 Procedure 141

=Minerva=, Free-hand Sketch of iii

=Miter-Wheel= desc. 199, 204, illus. 204

=Model=, def. 46

=Nonagon=, def. 47

=Numbering= Drawings, Office Rules for 194-5

=Numerals=, illus. 173

=Oblique=, def. 46

=Oblique Lines= How to Draw, 32, 58, illus. 59, 63

=Oblong=, def. 46

=Obtuse Angle=, def. 42

=Obtuse-Angled Triangle=, def. 50

=Octahedron=, def. 48

=Octagon=, def. 47 To Describe on a given straight line 95 To Inscribe in a circle 96

=Oil Can=, illus. 77

=Optic Nerve=, illus. 253

=Optics=, in Drawing, def. 252

=Outline Picture=, desc. 152

=Oval=, def. 46 How to Draw an 71

=Overall=, def. 46