Figure 241 represents the plan and elevation of a cylinder with its top surface inclined at 45°. Also shown are the developments of its top surface and its vertical surface. Draw the plan and elevation. Divide the plan into twelve and project the points up to give the positions of lines dividing the vertical surface into twelve. To develop the top surface:1.Project lines from a′, b′, c′, etc., downwards and at right angles to the top surface and at any point draw line a′ – g′ which is the centre line of the development.2.With centre 1′ and radius 1 – b in the plan, mark points b′ and I’ in the development.3.With centre 2′ and radius 2′ c in the plan mark c′ and k′ in the development, and so on until all the points are obtained through which a freehand line can be drawn to obtain the shape of the top surface — an ellipse.
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- The Cylinder and Related Examples
F.B.I.C.C. A. B. Emary
- Macmillan Education UK
Neuer Inhalt/© ITandMEDIA