Elementary Geometrical Drawing. Part I. ...1861 |
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Common terms and phrases
angle contained angle of 30 angular points axis circle cutting cube describe a circle diagonal dicular dihedral angle draw a plane draw a straight Draw the plan edge eleva ellipse evidently faces feet generatrix given angle given inclination given plane given point given straight line ground line hori horizontal plane horizontal trace hypothenuse inches long inches side inclined at 25 intersection isometric projection line A B line of level meet x y octahedron parallel to x y pendicular pentagon perpen perpendicular to xy plane containing plane inclined plane of projection plane of reference plane P Q R plane perpendicular plane required point to draw prism PROBLEM profile plane projecting plane pyramid rays of light required plane scale shadow cast solid straight line drawn straight line parallel surface tangent plane tion vertex vertical plane vertical trace
Popular passages
Page 8 - The projection of a point upon a plane is the foot of the perpendicular drawn from the point to the plane. Thus A' is the projection of the point A upon the plane MN.
Page 95 - A pyramid having for its base a square of 2-5" side, and its axis 3-25" long, rests with one face on the horizontal plane. Draw its plan, and a sectional elevation on a vertical plane represented by a line bisecting the plan of the axis and making an angle of 60° with it. 6. Draw the plan of a school-room 36
Page 49 - Through any point in the first line draw a line parallel to the second ; the plane through these is parallel to the second line. Through the second line draw a plane perpendicular to the fore-named plane cutting the first line in a point. Through this point draw a perpendicular in the second plane to the first, and it will be perpendicular to both lines.
Page 74 - Through a given point in a given plane, to draw a straight line...
Page 73 - Through a given straight line to draw a plane perpendicular to a given plane . . . .153 flane Geometry is that part of Geometry which treats of plane figures and lines in one plane.
Page 47 - Through a given point to draw a straight line which shall make equal angles with two straight lines given in position. Let P be the given point, and BE, CF the lines given in position. Produce BE, CF to meet in A, and bisect the angle BAG by the line c AD.
Page 56 - A cylinder is conceived to be generated by the revolution of a rectangle about one of its sides as an axis.
Page 30 - Through a given point to draw a straight line perpendicular to a given plane . Let AB be the ground line; EF', EG...
Page 97 - ... is perforated longitudinally and transversely by semicircular arches, springing at the same height, -viz., 10 feet 6 inches, and intersecting each other.
Page 55 - Find the volume of a sphere of radius a, considering the sphere as generated by the revolution of a circle about one of its diameters.