English: Arches of various forms as follows:— 19. The joggled arch used in medieval chimneypieces and in Mahommedan architecture. 21. The relieving arch as used in Egypt, in the pyramid of Cheops; and in Saxon architecture, where it was built with Roman bricks or tiles, or consisted of two sloping slabs of stone. Illustration from 1911 Encyclopædia Britannica, article Arch.
This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
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