Cjiap. VI.

FRANCE.

273

Bridge of Rosoi, on the Hyeres , erected in 1787, from a design by M. Ferronet, and con-sisting of two segmental arches, equal to one-sixth of a circle, 25 feet 6 inches in span; thethickness of the abutments is 12 feet 9 inches, and that of the pier 6 feet 4 inches; thethickness of the keystone is 3 feet- The arches and facings are of very hard sandstonecarefully dressed ; the breadth is 35 feet 2 inches.

Bridge of Brunoi, on the Hyeres , constructed in 1789, and, like the preceding, fromM. Perronet’s designs ; it consists of three arcs equal to one-sixth of a circle, and 19 feet 2 inchesin span. The thickness of the piers is 3 feet 9 inches, and that of the abutments 10 feet

Fig.282,

BRIDGE OF BRC5GI

8 inches; the springings of the arches are 7 feet 5 inches above the last set-off; thethickness of the keystone is 2| feet. The bridge is entirely constructed of squared stonesand the foundations are laid on a platform 3 feet 3 inches thick ; the total width is 30 feet4 inches.

Bridge of Louis XVI . at Paris , begun 1787, and finished 1791, from M. Perronet’s design.It has five segmental arches of 75 feet 9 inches, 85 feet 3 inches, and 94 feet span : the per-pendiculars are 6 feet 4 inches, 8 feet 9 inches, and 9 feet 9 inches. The thickness of thepiers is 9 feet 6 inches. The starlings are formed by columns 9 feet 6 inches in diameter,rising to the cornice; three-fourths of their radius are, however, hidden within the piers.The abutments are 51 feet 3 inches thick. The width of the bridge is also 51 feet 3 inches,and each footway is 8 feet wide. The thicknesses of the keystones are 3 feet 2 inches,3 feet 3 inches, and 3 feet 8 inches, not comprising 10 inches for the prolongation of thelower part of the architrave.

The springings of the arches are 19 feet 2 inches above low water. The piers and abut-ments are built on steps with a projection of 6 feet 4 inches. The platform is 5 feet 6inches below low water. The stone was from the works at Gare and the ruins of theBastille.

This bridge was constructed and decorated with the greatest care. The elevation iscrowned by an entablature supported on modillons; the parapet is formed of balusters.Above the starlings of each pier are square socles intended for the support of iron obelisks,but for which colossal marble statues have now been substituted. It is to be regretted thattheir proportions, as well as those of the pedestals, are too large. In the bridge of StAngelo at Rome this point is much better attended to.

Bridge of Gignac , on the Herault , begun 1777, finished 1793, by M. Garipuy : it consists,of two semicircular arches 83 feet in span, with cornes de vache, and a great elliptical archrising a third, 160 feet 9 inches in span, on piers 8 feet 6 inches high, ornamented with anarchivolt: their thickness is 25 feet 7 inches.

Bridge at the union of the Southern Canal with that of Narhonne. The bridge is built atthe point where the southern canal makes an elbow, so that it is the means of uniting threebranches of canals and three of roads.

The arches are arcs of circles, in order to accommodate the towing-paths of the canals.The faces of the bridge are curved to facilitate the junction of the roads.

M. Belidor has described a similar bridge situated at the junction of the Ardres andCalais canals, which unites four arms of canals and four of roads. The arches are semi-circular.

Bridge of Herault , on the road to Nice. This arch, designed by M. Grangent is 105feet in span, and 19 feet high ; both extremities arc on the rock.

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