A Text Book of Geometrical Drawing: For the Use of Mechanics and Schools, in which the Definitions and Rules of Geometry are Familiarly Explained ... with Illustrations for Drawing Plans, Sections and Elevations of Buildings and Machinery: an Introduction to Isometrical Drawing, and an Essay on Linear Perspective and Shadows ... |
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angle of 45 applied arc cutting arch axis base line Bisect breadth called centre for describing circle circumference cone construction corners cube cut the arc Cycloid cylinder CYMA describe the arc diagram diameter dividers Dodecagon dotted lines draw a diagonal draw a line draw rays Draw the diagonals edge ellipsis EPICYCLOID erect perpendiculars extrados feet fillet foot front frustrum given line height hexagon horizontal line HYPERBOLA inches indefinite arc intersect the perspective joints joists lines drawn middle visual ray moulding number of equal object opposite ovolo parabola PARALLEL RULER parallelogram perspective plane point of distance point of sight points of division points of intersection polygon PROBLEM projection protractor pyramid quadrant radius equal regular polyhedrons right angles right line semicircle shadow shew shewn sides Sons PLATE spectator square square pyramid surface tangent Tetragon trapezium triangle vanishing point vertical voussoirs wall Wm Minifie
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Page 4 - Mechanical Drawing. A Text-Book of Geometrical Drawing for the use of Mechanics and Schools, in which the Definitions and Rules of Geometry are familiarly explained ; the Practical Problems are arranged, from the most simple to the more complex, and in their description technicalities are avoided as much as possible.
Page 12 - A QUADRANT is a sector whose area is equal to one-fourth of the circle, as fig. 5; the arc D. E being equal to one-fourth of the whole circumference, and the radii at right angles to each other. 12. A DEGREE. — The circumference of a' circle is considered as divided into 360 equal parts called DEGREES, (marked °) each degree is divided into 60 minutes (marked ') and each minute into 60 seconds (marked "); thus if the circle be large or small, the number of divisions is always the same, a degree...
Page 12 - A Segment is any part of a circle bounded by an arc and its chord. 51. A Semicircle is half the circle, or a segment cut off by a diameter. The half circumference is sometimes called the Semicircle. 52. A...
Page 16 - The square of a number is the product of that number, multiplied by itself. Thus, 4 is the square of 2, and 9 of 3.
Page 39 - ... continually as they are both produced, but which, though ever so far produced, never meets it. 19. If the asymptotes of four opposite hyperbolas cross each other at right angles, the hyperbolas are called right angled or equilaterial hyperbolas. PROPOSITION I. THEOREM.
Page 9 - A right-angled triangle (Fig. 24) is any triangle having one right angle. The side opposite the right angle is called the hypotenuse.
Page 4 - ... perpendicular to each other, they form a right angle as TQ R, (mechanics' squares, if true, are always right angled;) if the sides are nearer together, as S. Q.
Page 1 - ... shadows: the whole illustrated with fifty-six steel plates, containing over two hundred diagrams. By Wm.
Page 40 - CONE is a solid formed by the revolution of a right angled triangle about one of its legs as an axis.
Page 39 - H} fig. 1. 5th. If a cylinder be cut by any plane at right angles to its axis, the section will be a circle. 6th. If a cylinder be cut by any plane not at right angles to its axis, passing through its opposite sides, as at K. L or M. JV, fig.