File:1911 Britannica-Arch1.png
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1911_Britannica-Arch1.png (510 × 247 pixels, file size: 76 KB, MIME type: image/png)
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| Description |
English: An arch. The blocks, which are technically known as voussoirs, should be of a wedge shape, the centre or top block being the keystone A; the lower blocks B B which rest on the supporting pier are the springers, the upper surface of which is called the skewback, C C; the side blocks, as D, are termed the haunches. The lower surface or soffit of the arch is the intrados, E, and the upper surface the extrados, F. The rise of the arch is the distance from the springing to the soffit, G, the width between the springers is called the span, H, and the radius I. The triangular spaces between the arches are termed spandrils, K. Illustration from 1911 Encyclopædia Britannica, article Arch. |
| Date | |
| Source |
 Encyclopædia Britannica Eleventh Edition, Vol. 2, Page 342 |
| Author | Encyclopædia Britannica, 1911 |
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 17:15, 20 November 2012 | | 510 × 247 (76 KB) | Clarice Reis (talk | contribs) | User created page with UploadWizard |
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