To describe the Scima Recta, or Ogee, both ways.
Fig. 3. is described by the Oxi in this manner; having allowed the Fillet at top a, f, draw the Line a b, and bisect it, that is, part it in the middle in e; then with your Compasses take the Interval e b, and fixing one point in e, with the other describe the Arch c c, then with the same Interval, or distance, fixing one point in b, with the other, describe the Arch d d, and where these two Arches Intersect, or cut each other, there is the Center to describe the round, or lower part of the Ogee, to wit, e h b: Then fixing one point of the Compasses on the Intersection by d, extend the other to b, or e, and describe the arch e h b: Then to describe the Hol∣low, or upper part of the Ogee, take with your Com∣passes the Distance, or Interval e a, and fixing one point in e, with the other describe the arch c c, then keeping the Compasses, at the same distance, fix one foot in a, and with the other describe the arch d d, intersecting the other Arch in g: Then fixing one Foot in g, extend the other to e, or a, and describe the arch e h a, which compleats the Scima recta, or Ogee.