TO DRAW THE UPRIGHT OR PERPENDICULAR LINE.

This line demands the greatest attention, and any care bestowed upon it

will be amply repaid in the after studies.

Commence by placing a line of points down the side of the paper, examine

them very carefully to see that they are all the same distance from its

edge, hold the pencil as in the drawing, fig. 59, move the elbow well

out from the side, and join the points by a movement of the fingers and

thumb. When one line is complete, place the points for the next, and

examine them from the edge of the paper, not from the line just drawn.

Proceed in this manner until the paper is covered.

There is in most cases a tendency to place the points for this line in a

slightly inclined direction, as in writing, though in some instances the

tendency is the opposite, a thoroughly correct eye in this respect being

a rare gift: and it may be useful to suggest that the paper be so placed

that the line of points to be produced may be exactly in front of the

eye.

Self-Help Mechanical Drawing: An Educational Treatise · 第 41 / 140 题