Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)
Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 440
ch fall on curved surfaces : Theorem.—A ray which is tangential to the shadowsurface is also tangential to the shadow ; and the plan andelevation of the ray are respectively tangential to the plan andelevation of the shadow. Thus bt, ar touch the curves at f and r. Examples on Problems 338 and 339.… … C f & / 11 \ \\ i1 2. Draw Figs, (a) and (//) to the dimensions given above, and de- termine the shadows of the heads on the shanks, as in Proh.33S ; the rays making 450 with xy in plan and elevation. 3. Draw the projections (a) and (/) when the plans are turned through 45°. Then work Ex. 2. 4.…
