Problems in Descriptive Geometry for Span Classsearchtermclassspan And D
Problems in Descriptive Geometry for Span Classsearchtermclassspan And D
Walter Turner Fishleigh
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Scale, 1" = 10'. 380. [4] A new building was designed for a lithograph company with a saw- toothed roof, one roof plane being R(- 7", - 90°, + 30°). The points M(-4", + U", H-4") and N(- 21", + l-i", + i") are points in the ridges of two other roof planes parallel to R. Find these planes. 381. [2] The line A(- 80', - 30', - 17') B(- 20', - 88', - 82') is the outcrop of a bed of gypsum on a hillside and a vertical bore-hole at point C(- 55', - 83', - 15') showed the same bed at a depth of 20 fee...t. At a depth of 60 feet at the point C another bed was struck which is surmised to be parallel to the first. Find this plane. Scale, 1" = 20'. 382. [2] The hne A(- 90', - 42', - 21') B(- 54', - 24', - 5') and the line C(- 90', -24', -12') D(-54', -6', + 4') determine the inclined roof of a tunnel into a mountain. The point M(- 48', - 17', - 10') is in the floor of the tunnel, which is parallel to the roof. Find the floor plane. Scale, 1" = 12'. 383. [2] The line A(- 7r, ^- 3^", + 1") B(- 5^", + 1", + 2f") and the line BC(-3|:", + 3|", + ^") are two lines in a gable roof plane.
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