Fry, Horace Pugh. [from old catalog] · Philadelphia · leaf 33
trations and Patent Office draw-ings are examples in the use of line shading. 4. The distribution of light and shadafound in current practicein the case of a circular cylinder can be produced by assuming theillumination to come from the opposite sources S and Si (Fig. 25)in parallel rays, their… … Fig. 25. 31 5. The brightest part of an illuminated object is that whichreflects the rays of Hght directly into the eye of the observer.Assuming the Hght to fall as above described, and knowing theangle of reflection R must equal the angle of incidence I, referenceto Fig. 25 will show that the high…
Mechanical drawing
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