Essentials of drafting; a text and problem book for apprentice, trade and evening technical schools (1918)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 30
apart (Fig. 24). Angles. — When two lines cross they form angles. The sizeof the angle is determined by theamount of opening between thelines. The angle A, in Fig. 25, isgreater than the angle B. If thelines are revolved about their in-tersection, so that the angle A ismade equal to the angle B,… … Fig. 2 7 When a right 14 ESSENTIALS OF DRAFTING angle is divided into 90 equal small angles, each of these smallangles is called a degree. Then it takes 4 times 90, or 360,degrees to go all the way around the point where the hnes cross.Circles. — A circle is a curved line formed by moving onepoint…
Mechanical drawing
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