Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)
Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 395
but with the decline of Eoman power the art of vaulting was lost,and the churches of all Eoman Christendom remained with nothing buttimber roofs. But among the Greek Christians, or Byzantines, it was re-tained, or else re-invented; but the Greek vaulting consisted wholly ofspherical surfaces,…