( 6Si )

Though the Tyber be not lo Iwift as the Rhcsnc , yet it is Subject tö greaterInundations, as many lnseriptions aflure us. No River ever had so manyBridges Built with that Magnisicence and Art, as this; and though they wertmore Pompous, and Rieh in Rare Stones, ii Sculpture, &c. than that 1formerly sint you a draught os srom Montpelier ; yet they had the like Pro-vision for their Securiry, and Preservation, and their Design was much thesime ; which may be feen at Reme this very day at the o!d Pons Milvius( now Ponte Nolle ) near the Vin Flaminia ; in the Marble Remains os thePons /Emilius ( repaired wich Rieh Materials by Antoninus Pius ) on the sideof the RJpa, or Tr aß avere, near the Root os the Aventine Hili, where firstthe Pons Sublicius stood; as alio in the Pons Fabritius and the Ccflius, thatleads over to the Infula Tiberina ; in all which rherc are still very fair marksof the Old Roman Structure, and Design ; and. is that prodigious City had notbeen knockt lb oft to pieces by Barbarous Sackers, we might have had stili asciear proofs srom the other BriJges, Vig. the Pons Triumphalis, the Senatorius,.&e. But Gothisio and Northern Torrents broke ali besore them.

VI. A Tirnbcr Bridge may be Built 70 Foot Long, or somewhat more, with-o l?l»jViiUr b ' out an y PiH*r under it, which may be uscful in some Places where Pillarsuntler it ; srom camior be conVenicntly Built, aster this manner AC, and BO, are BtanisphiTsoci F° ot lang, and A B, is Z2. Foot Long. Under the Anglet are set twoetyo/ Oxford. Large Braces E L, and S R. At each End is a Wall, on which are laid twoi b -P- 714. Beams BH,and AD,each zoFoot Long; under theleare twoBr«w DE,andk-x. ai S. RH. There may alio be Braces at the Ends os the Arches, thu may lie Oblique-ly erosi the Bridge. It may be laid with Planks and Railed. Behind theWalls are Caufeys F D, and H N. Tite Length of the Bridge C M o, is 70FoOt; the Height KM, is 19 Foot.

»An Aqucductl VII. I. The Aqucdttü which is tobe mac€ near Maintenon, for the Car-»iMrVersiulles. yyjng the River Eure to Verfaillet,\v\[\ have in Length 7000 Fathom ; 4 6% where-».171. f.101 - be zy Fathom and 4 Foot High, the rest will be lower according

to the Difference of the Ground, but no lesi than 5 Foot and 6 Inches High.There will be to the laid AqucduEl 861 Arches, which, where they are High-est, will have 12. Fathom in. Breadth, and 8 Fathom in Thicknels, dimi-nilbmg to 14 foot at the Top. The other Arches will be leiser in Breadth,as well as Thicknels, according to the Nature of the Ground. The laidAqueduR will have 15 Inches Fall to every Thousind Fathom in Length;(b that for the 7000 Fathom, there will be 8 Foot 8 Inches Fall . The RJverts tö paß by Maintenon, te Pare Esipcrnon, Gajcran, Rambouillet, les EJfars,.te Perrey, Cognieret, and srom thence to Versailles. There are 14000, Soldiersthat Work there, under the command of the Marques d ’ Vxellc,- withthtee 'Commissarys of War for their Conduct:

176.1206. 2.. A Magazine for the Waters upon the Mountain Montboron is already

Cut, which will have 2.200 Perchesof Surfacc ( each Perch being 18 FrcnchFoot J and. n Foot in depth . In another place much lower, will be ano;eher Magazine, to receive the Waters of many Pools, the most part of whien