Descriptive geometry . Determine the intersection of the plane -with the solid, and develop the surface. Problem 1. (Arts. 120, 121, pages 83, 84.) Problem 2. (Art. 127, page 92.) Problem 3. (Arts. 124, 125, page 88.) Problem 4.(Arts. 122, 123, page 86.) Unit of measure, | inch. Space required for each problem, 7 x lO inches. PLATE 27 The generatrix makes an angleof 15= with H, and one Pitch 12 units: length of longestelement, !9 units. -26-

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