Modern Shop Practice: A General Reference Work, Τόμος 5

Εξώφυλλο
American Technical Society, 1917
 

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Σελίδα 290 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.
Σελίδα 285 - A Circle is a plane figure bounded by a curved line every point of which is equally distant from a point within called the center.
Σελίδα 305 - With F as a center and a radius equal to AM describe short arcs cutting those already drawn as shown at N. With E as a center and a radius equal to LB draw arcs above and below LM as before. With F as a center and a radius equal to BM, draw arcs intersecting those already drawn as shown at 0.
Σελίδα 350 - All of the elements of the cone are of the' same length, so that when the cone is rolled, each point of the base as it touches the plane will be at the same distance from the vertex. From this it follows that...
Σελίδα 245 - T-- square place the triangle so that the other 45-degree angle is in the position occupied by the first. If the two 45-degree angles coincide they are accurate. Triangles are very convenient in drawing lines at right angles to the T-square. The method of doing this is shown in Fig. 10. Triangles are also used in drawing lines at an angle with the horizontal, by placing them on the board as shown in Fig. 11. Suppose the line EF (Fig. 12...
Σελίδα 282 - ... angles thus formed are equal they are right angles. When two lines are perpendicular to each other the angles formed are right angles. An acute angle is less than a right angle. An obtuse angle is greater than a right angle. SURFACES. A surface is produced by the motion of a line; it has two dimensions, — length and breadth. A plane figure is a plane bounded on all sides by lines ; the space included within these lines (if they are straight lines) is called a polygon or a rectilinear figure.
Σελίδα 267 - The guide lines of the date, name and address are similarly drawn in the lower margin. The date of completing the drawing should be placed under Fig. 3 and the name and address at the right under Fig. 4- The street address is unnecessary. It is a good plan to draw lines...
Σελίδα 258 - They should not fall short of the guide lines nor extend beyond them. As these letters are inclined they will look better if the inclination is the same for all. As an aid to the beginner, he can draw light pencil lines, about ^ inch apart, forming the proper angle with the parallel lines already drawn. The inclination is often made about 70 degrees ; but as a 60-degree triangle is at hand, it may be used.
Σελίδα 363 - ... In Fig. 70, take especial notice of the shade lines. These are put on as if the group were made in one piece ; and the shadows cast by the blocks on one another are disregarded. All upper horizontal faces are light, all left-hand (front and back) faces light, and the rest dark. OBLIQUE PROJECTIONS. In oblique projection, as in isometric, the end sought for is the same — a more or less complete representation, in one view, of any object. Oblique projection differs from isometric in that one...
Σελίδα 357 - Fig. 49 shows a cube with circles inscribed in the top and two side faces. The isometric of a circle is an ellipse, the exact construction of which would necessitate finding a number of points; for this reason an approximate construction by arcs of circles is often made. In the method of Fig. 49, four centers are used.' Considering the upper face of the cube, lines are drawn from the obtuse angles/" and e, to the centers of the opposite sides.

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