Fig. 249.
Fig. 250.
Now, take a radius of half an inch, and in the corner of each square draw with the bow-pencil a circular arc meeting the pencil lines exactly; with the bow-pen ink in the arcs first, then ink carefully the lines joining with the arcs; all lines must be of the same width; put in the shade on arcs and lines as in [fig. 249]; and, finally, erase the pencil lines at corners, etc.
Section-Lining.
Cross-hatching has been defined in the “preliminary definitions” to drawing; this term represents the practice of drawing diagonal lines representing the interior of an object, shown as a piece cut in half or when a piece is broken away. This is done to make more of the parts show, or to exhibit more clearly the nature of the materials; hence section lining and cross-hatching tell the same thing, i. e., the drawing of diagonal lines, usually at an angle of 45°, to show that the object is broken away and the interior designed to be represented.
Cast iron.
Fig. 251.
Wrought iron.
Fig. 252.