Fry, Horace Pugh. [from old catalog] · Philadelphia [The John C. Winston co.] · leaf 27
th the principles of mechanical drawing, the construc-tion of a machine. 3. Book and magazine illustrations and Patent Office draw-ings are also examples. 4. The distribution of light and shade found in current practicein the case of a circular cylinder, can be produced by assuming theillumination… … ^ Fig. 21. 25 5. The brightest part of an illuminated object is that whichreflects the rays of light directly into the eye of the observer. As-suming the light to fall as above described, and knowing the angleof reflection R must equal the angle of incidence I, reference toFig. 21 will show that…
Mechanical drawing
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