Chap. VI i I.

BRITAIN.

4-V

,i>\

kx

w

m

il

i£iUT_=i^

wm

m

SR 1

"•-.:X.; ■ '‘XP7V T llIl^*i®

Fig. 553. THAMES AND MEDWAY TUNNEL.

Thames and Severn Canal , from the Stroudwater canal at Wallbridge, near Stroud ;beyond Sapperton it passes the Tarlton tunnel, which is 2 miles and 3 furlongs in length ;the span of the arch is 15 feet in the clear, and the highest point of the rock above it is250 feet. In some portions masonry has been dispensed with, the rock being sufficientlyhard to maintain itself. The canal passes the head of the Thames , and Sedlington St.Mary, where there is a branch to Cirencester . At Latton it is joined by a branch fromthe Wilts and Berks canal, and at Lechlade terminates in the Thames and Isis navigation.

Trent and Mersey commences at Wilden Ferry, where the Derwent joins the Trent;joins the Coventry and Fazeley canal at Fradley ; at Haywood Mill the Staffordshire andWorcestershire canal ; and at Stoke, the Newcastle-under-Lyne canal . It afterwardspasses the Ilarecastle tunnel, 2880 yards in length, and is joined by the Macclesfieldcanal, and at Preston Brook unites with the Duke of Bridgewater’s canal, and is thencontinued to Runcorn Gap, on the river Mersey. Mr. Brindley projected this canal, andcommenced the works, which were completed by Mr. IlenshalL There are altogetherone hundred and twenty aqueducts, six tunnels, and ninety-one locks. The lockage fromIlarecastle summit to the Trent is 316 feet, and that from the summit of the Duke’scanal is 326 feet.

Tetney Haven Navigation was projected by Mr. John Grundy, engineer, in 1761, whenMr. Smeaton w*as consulted upon the practicability of carrying it into effect. A navigablecanal was to be formed from Tetney Haven to the upper end of Avingham-out-Fcn, andfrom thence to join the River Lud, or Louth River , between Ringers Drain and AvinghamMill; and from thence, partly by the course of the river, but chiefly by a new canal up tothe town of Louth .