Tas-de-charge

In architecture, tas-de-charge is a French language term for which there is no equivalent in English, given to the lower courses of ribs of a Gothic vault, which are laid in horizontal courses and bonded into the wall, forming a solid mass. This helps bond the ribs, vault and walls together. They generally rise about one-third of the height of the vault, and as they project forwards they lessen the span to be vaulted over.

Arch C has a tas-de-charge

References

This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Tas-de-Charge". Encyclopædia Britannica. 26 (11th ed.). Cambridge University Press. p. 437.

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