Page:An introduction to linear drawing.djvu/23

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5. Draw a right line and continue it twice length. (fig. 4.)

6. Draw a right line and lengthen it three times its length. (fig. 3)

7. Cut a right line into three equal parts. (fig 4.)

8. Cut a right line into six or eight equal parts, and so on.

It will be a useful exercise at this stage of the business, to show the parts of a line when divided. Thus, if required to show how much three quarters of a line are, the pupil must find one quarter, and the rest of the line will be three quarters. To find three fifths of line, cut the line into five parts, and take three of them. A very correct idea of fractions may in this way be communicated.

9. Draw a line one inch long, then two, three, four, five, six. (fig. 5.)

10. Draw a line and divide it into inches.

It is of no consequence what the length of the line is. Begin at the left and mark as many whole inches as there may be.

11. Draw a horizontal line.

A horizontal line is one drawn from left to right, or from right to left. The surface or top of a bowl of water is horizontal or level.

12. Draw a perpendicular line. (fig. 6.)

A perpendicular or vertical line is one perfectly upright, as a string, with a weight at the end of it, will hang from a nail, or from the hand.