Geometrical Drawing, Mechanical Drawing, Sketching, Practical Projection, Development of Surfaces

Front Cover
International Textbook Company, 1920 - Drawing

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Page 41 - ... all points for every position of the ruler. The plane surface represented by the top of one table is said to be " in the same plane " as the corresponding surface of the other table. The same could be said with reference to any other surfaces answering the same test. Any number of flat surfaces are said to be in, or to "lie in," the same plane with one another, and the same is true of any lines or points used to define any surface or position in that plane. The planes in the foregoing illustration...
Page 8 - 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.
Page 12 - A cone (Fig. 55) is a solid whose base is a circle and whose convex surface tapers uniformly to a point called FIG.
Page 6 - A polygon is a plane figure bounded by straight lines. The term is usually applied to a figure having more than four sides. The bounding lines are called the sides, and the sum of the lengths of all the sides is called the perimeter of the polygon. 63. A regular polygon is one in which all the sides and all the angles are equal. 64. A polygon of five sides is called a pentagon ; one of six sides, a hexagon ; one of seven sides, a heptagon, Pentagon. Hexagon. Heptagon. Octagon. Decagon. Dodecagon.
Page 23 - III,, p. 4); and therefore, the value of any angle will be found by dividing four right angles by the number of sides of the polygon. Cor. 2. To inscribe a regular polygon of any number of sides in a given circle...
Page 63 - P as a center and any convenient radius (about 2 inches) draw the. indefinite arc ED cutting the line A C. Now with the same radius and with D as a center, draw an arc P Q. Set the compass so that the distance between the needle point and the pencil is equal to the chord P Q. With D as a center and a radius equal to PQ, describe an arc cutting the arc ED at H. A line drawn through P and H will be parallel to A C. Proof. Draw the line Q H.
Page 132 - GH indicates that only a part of the rivet is shown. This is done so as not to take up too much space on the drawing. Fig. 9 shows an...
Page 3 - ... construction lines except those projectors shown on the reduced copy of the plate, those lines only being inked in that are necessary to show the outlines of the figure and the line of intersection in each view, as well as the outer projectors.
Page 67 - AC should be, for this plate, 1^" long. Produce AC to B. From C as center, with a radius equal to CA, describe the semicircle A 128456 7 B, and divide it into as many equal parts as there are sides in the required polygon (in this case eight). From the point C, and through the second division from B, as 6, draw the straight line C6.
Page 13 - The section is a figure similar to the base; (c) The area of the section is to the area of the base as the square of the distance from the vertex is to the square of the altitude of the pyramid or cone. 18. Two triangular...

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