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Reference number

3r (SM volume 41)

Purpose

3r (SM volume 41)

Notes

Part-section through bridge with basket handle arch, labelled: road for horse, radius 25o and dimensions givenMonsieur Perronnet observed to us that his Arches of Nueillie were Described / with a Ray of 240 french feet, and as in that Bridge the greatest part of the arch / which tends to fall was Supported, it was evident that Semicircular Arches of 480 / or even 500 ft Span might easily be built a thing hitherto unknown he also told / us that of his Arches at Nueillie upon a Chord of 30 ft only rose 5½ inches he / showed us the Construction of the Centers on which the arches of this Bridge / were turned very simple and Supported each only upon two legs or pieces the / timber in them was entire and no tenents nor mortoises any where employed / I do not remember exactly the Construction but it was on this principle the / pieces A double and framed to Clip the rest wedges for casing the Centers at B /Part-section of the bridge's formwork labelled A and B several timesWhen the Wedges and braces between / each Center were struck, and the / pins of the Keys A drawn the whole / was loose, and tackles and pullys / being fixed to the Crowns of all the / Centers and fastened to Capstons on / the banks of the River all the were / pulled down in less than three / minutes and fell in pieces into the / river with an amazeing Shock / without doing the least damage.

Level

Drawing

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