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H Fig. 09 56 FIRST PRINCIPLES OF From the foregoing explanation it will be seen, on reference to Fig. 98, that a sectional front or side elevation of an object may be ob- tained in the same way as a simple elevation, for it is only necessary to assume the object as cut through by a vertical section plane, such as that shown in the figure, and the part cut off by it nearest the eye removed ; the view then obtained when looking in the direction of the arrow s w r ould be the elevation required. 26. Having explained at some length the specific meaning of a sectional plan, and of a front, and side, and " sectional elevation " of an object, we will now revert to the problem of showing how to obtain by actual projection the sectional plans of objects, taking for our pur- pose those given in the diagram Fig. 96. The first on the left is assumed to be a beam of wood of rectangular section, shown with its two widest sides parallel to the HP, and its narrow ones perpen- dicular to it. As a horizontal section of a beam in such a position would give in plan a similar projection to the one already shown, and lettered in the diagram Fig. 96 " Plan of Original Object," we will, for the better practice afforded, assume the beam to have its sides inclined to the HP, as shown at A, Fig. 97, Sheet 2, and the cutting or section plane x y to pass through it horizontally when in that position from end to end. We will assume also that all the sides of the beam are coloured green. The problem then is to obtain by projection a plan of the beam when the upper part cut off by the section plane x y is removed.