Descriptive geometry for students in engineering science and architecture; a carefully graded course of instruction . s found. For the remaining two corners of the plan draw diagonallines parallel to the plans of the edges already found. The elevation of the pointE may be obtained by drawing a line through the elevation of D from the elevationin XY of the point F. The use of rabattement is again illustrated in Fig. 47, where two lines ABand BC enclose an angle the size of which it is required to find. As any two lineswhich meet each other have a common plane whose traces will contain the trace
Descriptive geometry for students in engineering science and architecture; a carefully graded course of instruction . s found. For the remaining two corners of the plan draw diagonallines parallel to the plans of the edges already found. The elevation of the pointE may be obtained by drawing a line through the elevation of D from the elevationin XY of the point F. The use of rabattement is again illustrated in Fig. 47, where two lines ABand BC enclose an angle the size of which it is required to find. As any two lineswhich meet each other have a common plane whose traces will contain the tracesof the lines, it is only necessary to find the of each of the hnes at R and Srespectively, and the fine passing through these is the of the plane of thelines. Use this as a hinge line about which to rabat the plane. Set upthe usual right-angled triangle whose hypotenuse can be used to swing down Bto its rabattement 62. This point joined to the traces of the lines will give the RABATTEMENT OF PLANES 43 rabattement of the angle, showing its true size. This is marked in the figureby the arrowed EXERCISK X\II 1. Find the plan of a regular pentagon, i^ edge, whose plane is at 60 to the and whichhas an edge at 30° to the 2. Iind the plan and elevation of a regular hexagon, i edge, when it lies in an obliqueplane with \.T. at 60° to XY and at 45° to XY, and when one edge of the tigure is at20° to the
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcetc, bookyear191
