Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . f the plan shows, pictorially, the figure to be PROJECTION OF SOLIDS. — WORKIXG DRAWINGS. 141 The plan of the lower base will be the rectangle abde, 3 X 2, whose longer edges are inclined30° to the horizontal. Take AB and ma as the H-traces of auxiliary, vertical planes, perpendicular to the side andend faces of the Ijlock. Then the sloping face whose lower edge is d e, and which is inclined 60 °to H, will have d,?/ for its trace on plan
Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . f the plan shows, pictorially, the figure to be PROJECTION OF SOLIDS. — WORKIXG DRAWINGS. 141 The plan of the lower base will be the rectangle abde, 3 X 2, whose longer edges are inclined30° to the horizontal. Take AB and ma as the H-traces of auxiliary, vertical planes, perpendicular to the side andend faces of the Ijlock. Then the sloping face whose lower edge is d e, and which is inclined 60 °to H, will have d,?/ for its trace on plane mn. A jjarallel to mn and ?^ from it will give -Sj, theauxiliary projection of the upj^er edge of the face sved, whence sv—at first indefinite in length—isderived, parallel to de. Similarly the end face btsd is obtained by projecting db upon AB at 6,,drawing b^z at 60° to AB and terminating it at Sj by CD, drawn at the same height (xVO ^^before. A parallel to bd through s.^ intersects vs^ at s, giving one corner of the plan of the upperbase, from which the rectangle stuv is completed, with sides parallel to those of the lower As the recess has ^-ertical sides we may draw its plan, o p q r, directly from the given dimen-sions, and show the depth by short-dash lines in each of the elevations. The orcUnary elevations are derived from the plan as in preceding problems; that is, for thefront elevation, ausd, by verticals through the plans, temiinating according to their height, eitheron ad or on los, ?^ above it. For the side elevation, evtb, with the heights as in the frontelevation, the distances to the right or left of s equal those of the plans of the same points i, regarding the latter as the h. t. of a central, vertical plane, parallel to V. The plane ST of right section, jjerpeyidicular to the axis KL, cuts the block in a section whosetrue .size is shown in the line-tinted figure g^h^kj^, and whose construction hardly needs detailedtreatment after wha
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Keywords: ., bookcentury1800, bookdecade1890, booksubjec, booksubjectlettering
