Three-view drawings

Even though the front view provides the most detail about the item, other views usually are required for a complete engineering drawing. We can add more views to provide details not seen in the front view. Most multiview drawings include three views and are thus called three-view drawings. Typically, the three-view drawings contain (1) the front view, (2) the top view, and (3) the right side view. 

View the three-dimensional drawings with the aid of the viewer inside the cover of the text. 

At this point, you may realize diat the top view is similar to the bottom view, the front view is similar to the back view, and the rigjbit-side view is similar to the left-side view. Thete-frire, you notice some redundancy in the information provided by these six views (diagrams). Therefore, you conclude that you do not need to draw all six views to describe this object. In fact, the number of views needed to describe an object depends on how complex the shape of an object is. So the question is, then, how many views are needed to completely describe the object. For the objea shown in Figure 16.1, three views are sufficient to frilly describe the object, because onty three principle planes of projecdon are needed to show the object. For the example shown in Figure 16.1, we m decide to use the top, the front, and the ri t-side views to describe the object completely. In feet, the top, the front, and the right-side views are the most commonly created views to describe most objects. These views are shown in Figure 16.3. 

Most multiview drawings consist of three views front view, top view, and right side view. 

FIGURE 10.29 Three-dimensional recon-strnction of porin from Rhodohacter capsulatus. Drawings of (a) side view of porin monomer showing /3-sheet strnctnre. (b) Top view and (c) nearly top view of porin trimer. 

According to this partisan view of the evolution of theoretical chemistry we draw the impression of a choice, in which the single molecules represent the basic unit of investigation, the quantum theory provide the theoretical basis, and computer calculations the final step. The three periods of growth are, in reality related, and the " sudden" changes in between do not corresponds to "revolutions" in according to the meaning this word has in the Kuhn s analysis [4]. 

Some companies use it only to obtain a rough three-dimensional view of the plant. Others include on it all pipes, valves, and electrical lines. In this case, a large number of orthographic drawings and layouts will be eliminated. In some cases the dimensions for some piping may be taken directly off the model, although usually a pipe sketch is also included (see Fig. 12-3) for each pipeline. This is sometimes... 

Figure 4. Expanded view of standard three-piece filter cassette. (Drawing courtesy of the...

The three-dimensional structure of cholera toxin.6 Side view of the p subunit pentamer as a ribbon drawing. Bound noncovalently to it are five molecules of the ganglioside Gm1 (compare with the structure in Fig. 7-5). The diacyl glycerol parts of the gangliosides are buried in the membrane that lies below the toxin molecule. Courtesy ofW.G.J. Hoi. 

Figure 16-3 Structure of the protein shell of ferritin (apoferritin). (A) Ribbon drawing of the 163-residue monomer. From Crichton.62 (B) Stereo drawing of a hexamer composed of three dimers. (C) A tetrad of four subunits drawn as a space-filling diagram and viewed down the four-fold axis from the exterior of the molecule. (D) A half molecule composed of 12 subunits inscribed within a truncated rhombic dodecahedron. B-D from Bourne et al.7i...

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