Explore Collections
You are here:
CollectionsOnline
/
3v (SM volume 41)
Browse
Reference number
3v (SM volume 41)
Purpose
3v (SM volume 41)
Notes
Monsieur Perronnet observed that in such large Arches when the lower stone / of the Arches were set it forced the Center considerably up at the Crown to / prevent which it was always proper to load the Crown of the Center consider / ably and that the Arches were nearly closed, the Centers settle somewhat / which occasioned sometimes large opnings in the Spandrels, but that the mo / ment the Key stones were in the Arch took a different bearing and all / the openings in the Spandrels filled up directly, to prove this and to determine / the exact extent of the acting and resisting part of an Arch he showd us / an experiment made on a large Arch built by him, by which appeard / that on striking the Center the part from A to A Settled gradually from / the Crown and the parts from A to B where forced somewhat outwards in the / direction of the Curve line ACB / Diagram of stretched arch, labelled B, C, A and AHis design for the Bridge at the Place de Louis XV has exceeding Slight / piers not exceeding one tenth of the opening of the Arch and they are / moreover made in the forms of Columns so that there is an open passage / under the Bride from one end to the other as here represented Monsr Peronet / though an excellent Engineer is but a very indifferent Architect has given / no beauty to any of designs but upon this pricipal and with his dimen- / made perhaps in the Manner here Sketched / and in various others.Part-elevation showing two stretched arches, two piers and the superstructure of a bridge
Level
Drawing
Digitisation of the Drawings Collection has been made possible through the generosity of the Leon Levy Foundation
If you have any further information about this object, please contact us: drawings@soane.org.uk