The American builder's companion : or, A system of architecture, particularly adapted to the present style of building ; illustrated with seventy copperplate engravings by Benjamin Asher 1773-1845

Author:Benjamin, Asher, 1773-1845
Language: eng
Format: epub, pdf
Tags: Architecture, Architecture -- United States
Publisher: Boston : R.P.&C. Williams
Published: 1827-03-25T05:00:00+00:00

The proportion of the pediments depends upon their size ; for the same proportion will not succeed in all cases. When the base of the pediment is short, its height must be increased ; and when long, it must be diminished ; for if a small pediment be made low, the inclined cornice, which is always of the same height, whatever may be the dimension of the pediment, will leave little, or no space, for the tympan ; consequently, little, or no plain repose, between the horizontal and inclined cornices. And if a large pediment be made high, it will have too lofty a tympan, and the whole composition will appear straggling, and too heavy for that which is to support it. The best proportion for the height, is from one fifth to one quarter of the base, according to the extent of the pediment, and the character of the body it serves to cover.

The face of the tympan is always placed on a line perpendicular with the face of the frieze ; and, when large, may be adorned with sculpture, representing the arms or cypher of the owner ; trophies of various kinds, suited to the nature of the structure ; but, when small, it is much better left plain.

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