34
Fifth Class.
The figures of the Fifth Class are formed by the union of such lines as have already been given, viz. horizontals, perpendiculars, and arcs of circles or ellipses.
1. Draw a fillet. (fig. 1.)
2. Draw a bead. (fig. 2.)
3. Draw a congee. (fig. 3.)
These mouldings, as they are called in architecture, are so simple as to need no explanation. Horizontals and verticals will be found in them, with circles, of which the dotted lines mark the centre.
4. Draw a torus with its plinth. (fig. 4.)
