First Principles of Mechanical and Engineering Drawing |
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angle of 45 apex arrow assumed axes axial line axis base bisect centre circle cone construction cube curved line curved surface cutting plane cylinder diagonal diagram diameter direction distance draughtsman draw a line draw lines parallel draw projectors edges ellipse ENGINEERING DRAWING equal faint lines find by projection find the development find the elevation find the plan front elevation frustum give given line horizontal inclined join length let fall projectors line drawn lines of intersection lines of penetration meridians original object pencil plan and elevation plane of section plane passing plane surface planes of projection points thus found produced projection the elevation projectors drawn radius rectangle required elevation rhombus right angles right lines section plane seen semi-circle set-squares sheet side elevation solids of revolution sphere square pyramid straight line student thickness triangle upper plane vertical projection VP and HP
Popular passages
Page 20 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, etc.
Page 98 - A cylinder is conceived to be generated by the revolution of a rectangle about one of its sides as an axis.
Page 22 - In like manner, a figure is said to be described about another figure, when all the sides of the circumscribed figure pass through the angular points of the figure about which it is described, each through each. III. A rectilineal figure is said to be inscribed...
Page 207 - A sphere may be generated by the revolution of a semi-circle about its diameter as an axis.
Page 22 - One right-lined figure is Inscribed in another, or the latter circumscribes the former, when all the angular points of the former are placed in the sides of the latter. 67. A Secant is a line that cuts a circle, lying partly within, and partly without it.
Page 39 - Witt be parallel to the ground line. Case 4. (PL V. Fig. 76.) Suppose two points as a and b to lie in the horizontal plane of projection, where are their vertical projections? From what has been already shown...
Page 28 - French geometer, by demonstrating, in the first place, that the angles of any triangle are together equal to two right angles and deducing from thence, that two lines, which make with a third line the interior angles, less than two right angles, must meet if produced.
Page 187 - A surface which can be generated by the motion of a straight line is called a ruled surface. The infinitude of straight lines which thus lie on the surface are called its
Page 78 - Fig. 184. Fig. 186. shade side. This distinction assists in contrasting flat and curve surfaces. To understand and apply the shade lines, however, we must know the direction in which the light is supposed to fall upon the object, and thence the locality of the shadows.
Page 200 - A A' as a diameter describe a semicircle, and divide it into any number of equal parts...