projection. The rear plane is hinged to the right side plane, but it could hinge to either of the side planes or to the top or bottom plane. View B shows that the projections on the sides of the box are the views you will see by looking straight at the object through each side. Most drawings will be shown in three views, but occasionally   you   will   see   two-view   drawings, particularly  those  of  cylindrical  objects. A three-view orthographic projection drawing shows the front, top, and right sides of an object. Refer to figure 3-7, view C, and note the position of each of the six sides. If you eliminate the rear, bottom, and left sides, the drawing becomes a conventional 3-view drawing showing only the front, top, and right sides. Study the arrangement of the three-view drawing in figure 3-8. The views are always in the positions shown. The front view is always the starting point and the other two views are projected from it. You may use any view as your front view as long as you place it in the  lower-left  position  in  the  three-view.  This  front view   was   selected   because   it   shows   the   most characteristic feature of the object, the notch. Figure 3-9.—Pull off the views. The right side or end view is always projected to the right of the front view. Note that all horizontal outlines of the front view are extended horizontally to make  up  the  side  view.  The  top  view  is  always projected directly above the front view and the vertical outlines of the front view are extended vertically to the top view. After you study each view of the object, you can see it as it is shown in the center of figure 3-9. To clarify the three-view drawing further, think of the object as immovable (fig. 3-10), and visualize yourself moving  around  it.  This  will  help  you  relate  the blueprint views to the physical appearance of the object. Figure 3-8.—A three-view orthographic projection. Figure 3-10.—Compare the orthographic views with the model. Now  study  the  three-view  drawing  shown  in figure 3-11. It is similar to that shown in figure 3-8 with one exception; the object in figure 3-11 has a hole drilled in its notched portion. The hole is visible in the top  view,  but  not  in  the  front  and  side  views. Therefore, hidden (dotted) lines are used in the front and side views to show the exact location of the walls of the hole. The three-view drawing shown in figure 3-11 introduces two symbols that are not shown in figure 3-8 but are described in chapter 2. They are a hidden line that shows lines you normally can’t see on the object, and a center line that gives the location of the exact center of the drilled hole. The shape and size of the object are the same. 3-4