Mechanical Drawing: A Manual for Teachers and Students

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Ginn & Company, 1895 - Mechanical drawing - 197 pages
 

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Page 185 - PERIPHERY of a circle is its entire bounding line ; or it is a curved line, all points of which are equally distant from a point within called the centre.
Page 195 - 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 187 - A cylinder of revolution is a cylinder generated by the revolution of a rectangle about one side as an axis.
Page 184 - If the radius of the circle moves through -J^LJ of the circumference, it produces an angle which is taken as the unit for measuring angles, and is called a degree. The degree is divided into sixty equal parts called minutes, and the minutes into sixty equal parts called seconds. Degrees, minutes, and seconds are denoted by symbols. Thus 5 degrees, 13 minutes, 12 seconds, is written 5° 13
Page 22 - AB of the circle into as many equal parts as the polygon is to have sides. With the points A and B as centers and radius AB, describe arcs cutting each other at C.
Page 188 - Elevation. A drawing made on a vertical plane by means of projecting lines perpendicular to the plane from the points of the object. The terms elevation, vertical projection, and front view all have the same meaning. Ellipse. A plane figure bounded by a line such that the sum of the distances of any point in it, as c, from two given points e and f, called foci, is equal to a given line, as a b. The point midway between the foci is called the center.
Page 193 - A right prism is one whose lateral edges are perpendicular to the bases. A regular prism is a right prism having regular polygons for bases.
Page 191 - A cylinder or prism, whose axis is its least dimension. It is circular, triangular, square, etc., according as it has circles, triangles, squares, etc., for bases. Polygon. A plane figure bounded by straight lines. An EQUILATERAL POLYGON is one whose sides are all equal. An EQUIANGULAR POLYGON is one whose angles are all equal. A REGULAR POLYGON is one which is equilateral and equiangular. PARALLEL POLYGONS are those whose sides are respectively parallel.
Page 185 - Balance. The equality of parts, obtained by the proper distribution of lines or of light and dark. Base. The opposite parallel polygons of prisms. The polygon opposite the vertex of a pyramid. The plane surfaces of cylinders and cones. The opposite parallel sides of a parallelogram or trapezoid. The shortest or longest side of an isosceles triangle, and any side in any other triangle, but usually the lowest. Bisect. To divide into two equal parts. Bisector. A line which bisects.
Page 196 - The HYPOTENUSE is the side of a right triangle opposite the right angle.

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