In [Fig. 57] is shown the mechanical drawing of a cylinder,—the front view, as its name implies, being the image it would make in a mirror held before it vertically, and the top view the image it would make in a mirror held directly over it horizontally.
Fig. 57. Mechanical Drawing of a Cylinder
Fig. 58. Mechanical Drawing of End Lap Joint
Occasionally three views are necessary. [Fig. 58] a shows the front, top, and side views of an end lap joint. The complete working drawing of this joint, with all the necessary dimensions, is shown at b.
Fig. 59. Drawing Board showing T Square and Triangles in Position
In making drawings of this kind the greatest accuracy is required and special instruments are necessary.
The drawing board on which the paper is fastened must be perfectly flat, with one of its edges straight.