-ment of familiar illustrations will enable youngpupils to comprehend the subject readih. Take itup at different times, but do not dwell long uponit at any one time. The angle formed l\v the meeting of two planes,as by the floor and wall of the room, is called a dihe-dral angle. All angles may be… … TRIANGLES DEFINED. 59 DRAWING-BOOK EXERCISE IV. Lines forming Angles. Directions.—After what has been said about drawingstraight lines, the pupil will needvery few or no directions fordrawing the lines which formthese angles. The lines .shouldbe firm, not wavering ; giay, notblack ; and of equal…
Drawing
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