Tas-de-charge

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In architecture, tas-de-charge is a French term, also used 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.{{EB1911|inline=y|wstitle=Tas-de-Charge|volume=26|page=437}}