Curves
To draw curves that are not formed of arcs or parts of circles, templates called curves are provided, examples of these forms being given in Figure 6. They are made in wood and in hard rubber, the latter being most durable; their uses are so obvious as to require no explanation. It may be remarked, however, that the use of curves gives excellent practice, because they must be adjusted very accurately to produce good results, and the drawing pen must be held in the same vertical plane, or the curve drawn will not be true in its outline.
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Curves
<p>To draw curves that are not formed of arcs or parts of circles, templates called curves are provided, examples of these forms being given in Figure 6. They are made in wood and in hard rubber, the latter being most durable; their uses are so obviou... Drawing Gear Wheels
<p>The names given to the various lines of a tooth on a gear-wheel are as follows:</p> <p>In Figure 233, A is the face and B the flank of a tooth, while C is the point, and D the root of the tooth; E is the height or depth, and F the breadth. P P is... Drawing Instruments
<p>It is not intended or necessary to enter into an elaborate discussion of the various kinds of drawing instruments, since the purchaser can obtain a good set of drawing instruments from a reputable dealer by paying a proportionate price, and must <... Examples For Practice
<p>Figure 217 represents a simple example for practice, which the student may draw the size of the engraving, or he may draw it twice the size. It is a locomotive spring, composed of leaves or plates, held together by a central band.</p> <div> <img... Examples In Bolts Nuts And Polygons
<div> <img src="/images/drawing-0111-1.jpg" alt="" height="64" width="40"> Fig. 149. </div> <div> <img src="/images/drawing-0111-2.jpg" alt="" height="76" width="46"> Fig. 150. </div> <div> <img src="/images/drawing-0111-3.jpg" alt="" height="74" wi... Examples In Engine Work
<p>In the figures from 308 to 328 inclusive are given three examples in engine work, all these drawings being from <em>The American Machinist</em>. Figures 308 to 314 represent drawings of an automatic high speed engine designed and made by Professor... Examples In Line-shading And Drawings For Line-shaded Engravings
<p>Although in workshop drawings, line-shading is rarely employed, yet where a design rather than the particular details of construction is to be shown, line-shading is a valuable accessory. Figure 295, for example, is intended to show an arrangement... Line Shading
<p>Mechanical drawings are made to look better and to show more distinctly by being line shaded or shaded by lines. The simplest form of line shading is by the use of the shade or shadow line.</p> <p>In a mechanical drawing the light is supposed, for... Lines And Curves
<p>Although the beginner will find that a study of geometry is not essential to the production of such elementary examples of mechanical drawing as are given in this book, yet as more difficult examples are essayed he will find such a study to be of ... Marking Dimensions
<p>The dimensions of mechanical drawings are best marked in red ink so that they will show plainly, and that the lines denoting the points at which the dimension is given shall not be confounded with the lines of the drawing.</p> <p>The dimension fi... Names Of Regular Polygons
<div> <table summary="polygon names" border="0" cellpadding="4" cellspacing="0"> <tbody> <tr> <td align="left">A figure of</td> <td align="center">3 sides is</td> <td align="center">called a</td> <td ali... Plotting Mechanical Motions
<div> <img src="/images/drawing-0234-1.jpg" alt="" height="170" width="200"> Fig. 257. </div> <p>Let it be required to find how much motion an eccentric will give to its rod, the distance from the centre of its bore to the centre of the circumference... Projections
<p>In projecting, the lines in one view are used to mark those in other views, and to find their shapes or curvature as they will appear in other views. Thus, in Figure 225<em>a</em> we have a spiral, wound around a cylinder whose end is cut off at a... Reducing Scales
<div> <img src="/images/drawing-0178-1.jpg" alt="" height="135" width="139"> Fig. 224. </div> <div> <img src="/images/drawing-0178-2.jpg" alt="" height="49" width="155"> Fig. 225. </div> <div> <img src="/images/drawing-0181-1.jpg" alt="" height="408... Screw Threads And Spirals
<div> <img src="/images/drawing-0151-1.jpg" alt="" height="102" width="163"> Fig. 202. </div> <div> <img src="/images/drawing-0152-1.jpg" alt="" height="345" width="158"> Fig. 203. </div> <p>The screw thread for small bolts is represented by thick a... Section Lining Or Cross-hatching
<p>When the interior of a piece is to be shown as a piece cut in half, or when a piece is broken away, as is done to make more of the parts show, or show more clearly, the surface so broken away or cut off is section-lined or cross-hatched; that is t...