55. Arcade.—A series of arches with the columns or piers which support them, the spandrels above, and other parts.
56. Arch.—A curved member made up, usually, of separate wedge-shaped solids, A. K, Keystone; S, Springers; C, Chord, or span.
57. Buttress.—A projecting mass of masonry. A, used for resisting the thrust of an arch, or for ornamentation; B, a flying buttress.
58. Chamfer.—The surface A formed by cutting away the arris or angle formed by two faces, B, C, of material.
59. Cotter or Cotter Pin.—A pin, A, either flat, square or round, driven through a projecting tongue to hold it in position.
60. Crenelated.—A form of molding indented or notched, either regularly or irregularly.
61. Crosses.—1. Latin cross, in the Church of Rome carried before Bishops. 2. Double cross, carried before Cardinals and Bishops. 3. Triple or Papal cross. 4. St. Andrew's and St. Peter's cross. 5. Maltese cross. 6. St. Anthony or Egyptian cross. 7. Cross of Jerusalem. 8. A cross patté or fermé (head or first). 9. A cross patonce (that is, growing larger at the ends). 10. Greek cross.
62. Curb Roof.—A roof having a double slope, or composed on each side of two parts which have unequal inclinations; a gambrel roof.