Mechanical drawing

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American School of Correspondence, 1903 - Engineering
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Page 7 - CIRCLES. 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. The curve which bounds the circle is called the circumference.
Page 10 - A regular pyramid is one whose base is a regular polygon and whose vertex lies in the perpendicular erected at the center of the lsi.se.
Page 9 - In order to obtain accurate measurements each degree is divided into 60 equal parts called minutes and each minute is divided into 60 equal parts called seconds.
Page 12 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.
Page 22 - O F' it also bisects the angle formed by the lines AC and E F. PROBLEM 10. To Divide a Given Line into any Number of Equal Parts. Let AC, about 3^ inches long, be the given line. Let us divide it into 7 equal parts. Draw the line AJ at least 4 inches long, forming any convenient angle with A C. On AJ lay off, by means of the dividers or scale, points D, E, F, G, etc., each inch apart.
Page 11 - A cone is a solid bounded by a conical surface and a plane which cuts the conical surface. The plane is called the base and the curved surface the lateral area.
Page 38 - In Fig. 5 draw all arcs first and then draw the straight lines meeting these arcs. It is much easier to draw straight lines meeting arcs, or tangent to them, than to make the arcs tangent to straight lines. As this exercise is difficult, and in all mechanical and machine drawing arcs and tangents are frequently used we advise the beginner to draw this exercise several times. Leave all construction lines in pencil.
Page 4 - The usual method of fastening paper to a drawing board is by means of thumb tacks or small one-ounce copper or iron tacks. In fastening the paper by this method first fasten the upper left hand corner and then the lower right pulling the paper taut. The other two corners are then fastened, and sufficient number of tacks are placed along the edges to make the paper lie smoothly.
Page 15 - Cycloid. The cycloid is a curve generated by a point on the circumference of a circle which rolls on a straight line tangent to the circle.
Page 17 - In locating the figures, they should be placed a little above the center so that there will be sufficient space below to number the problem. The figures of the problems should first be drawn lightly in pencil and after the entire plate is completed the lines should be inked. In. pencilling, all intersections must be formed with great care as the accuracy of the results depends upon the pencilling. Keep the pencil points in good order at all times and draw lines exactly through intersections. GEOMETRICAL...

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