Discharging arch

Discharging arch
Cross section of the Pantheon showing the discharging arch on the right side
Example of relieving arch - Greenknowe Tower

A discharging arch or relieving arch is an arch built over a lintel or architrave to take off the super incumbent weight. The earliest example is found in the Great Pyramid, over the lintels of the entrance passage to the tomb: it consisted of two stones only, resting one against the other. The same object was attained in the Lion Gate and the Tomb of Agamemnon, both in Mycenae, and in other examples in Greece, where the stones laid in horizontal courses, one projecting over the other, left a triangular hollow space above the lintel of the door, which was subsequently filled in by vertical sculptured stone panels.

The Romans frequently employed the discharging arch, and inside the portico of the Pantheon the architraves have such arches over them. In the Golden Gateway of the palace of Diocletian at Split the discharging arches, semicircular in form, were adopted as architectural features and decorated with mouldings. The same is found in the synagogues in Palestine of the 2nd century; and later, in Byzantine architecture, these moulded archivolts above an architrave constitute one of the characteristics of the style. In the early Christian churches in Rome, where a colonnade divided off the nave and aisles, discharging arches are turned in the frieze just above the architraves.

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  • Discharging arch — Discharge Dis*charge , v. t. [imp. & p. p. {Discharged}; p. pr. & vb. n. {Discharging}.] [OE. deschargen, dischargen, OF. deschargier, F. d[ e]charger; pref. des (L. dis) + chargier, F. charger. See {Charge}.] 1. To relieve of a charge, load, or… …   The Collaborative International Dictionary of English

  • discharging arch — noun : relieving arch * * * an arch for taking some of the weight from a structural member beneath it. Also called relieving arch. [1810 20] * * * discharging arch noun An arch built in a wall to protect a space beneath from the weight above • •… …   Useful english dictionary

  • discharging arch — an arch for taking some of the weight from a structural member beneath it. Also called relieving arch. [1810 20] * * * …   Universalium

  • Discharging — Discharge Dis*charge , v. t. [imp. & p. p. {Discharged}; p. pr. & vb. n. {Discharging}.] [OE. deschargen, dischargen, OF. deschargier, F. d[ e]charger; pref. des (L. dis) + chargier, F. charger. See {Charge}.] 1. To relieve of a charge, load, or… …   The Collaborative International Dictionary of English

  • Discharging piece — Discharge Dis*charge , v. t. [imp. & p. p. {Discharged}; p. pr. & vb. n. {Discharging}.] [OE. deschargen, dischargen, OF. deschargier, F. d[ e]charger; pref. des (L. dis) + chargier, F. charger. See {Charge}.] 1. To relieve of a charge, load, or… …   The Collaborative International Dictionary of English

  • Discharging rod — Discharge Dis*charge , v. t. [imp. & p. p. {Discharged}; p. pr. & vb. n. {Discharging}.] [OE. deschargen, dischargen, OF. deschargier, F. d[ e]charger; pref. des (L. dis) + chargier, F. charger. See {Charge}.] 1. To relieve of a charge, load, or… …   The Collaborative International Dictionary of English

  • Discharging strut — Discharge Dis*charge , v. t. [imp. & p. p. {Discharged}; p. pr. & vb. n. {Discharging}.] [OE. deschargen, dischargen, OF. deschargier, F. d[ e]charger; pref. des (L. dis) + chargier, F. charger. See {Charge}.] 1. To relieve of a charge, load, or… …   The Collaborative International Dictionary of English

  • relieving arch — noun : an arch built over a lintel to relieve or distribute the weight of the wall above called also discharging arch * * * relieving arch noun An arch in a wall to relieve the part below it from a superincumbent weight • • • Main Entry: ↑relieve …   Useful english dictionary

  • Relieving arch — Relieving Re*liev ing, a. Serving or tending to relieve. [1913 Webster] {Relieving arch} (Arch.), a discharging arch. See under {Discharge}, v. t. {Relieving tackle}. (Naut.) (a) A temporary tackle attached to the tiller of a vessel during gales… …   The Collaborative International Dictionary of English

  • Safety arch — Safety chain Safety chain (a) (Railroads) A normally slack chain for preventing excessive movement between a truck and a car body in sluing. (b) An auxiliary watch chain, secured to the clothes, usually out of sight, to prevent stealing of the… …   The Collaborative International Dictionary of English

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