Chap. VIII.
BRITAIN.
431
Excavation and Drainage. £ s. d.
To excavation of the matter, 722 yards for each pier, at 6d. - 18 1 0
To drawing off the water, supposed equal to 50 days, at 20s.per day per pier - - - - - - 50 0 0
68 1 0
£
d.
The excavation and drainage of six piers, the two abutment piers, andfoundations for the wing-walls, being supposed equivalent to two piers,the whole will be equivalent to eight piers, at 68?. Is. each
Masonry in the piers and abutments , below the springing of the arches.
To 1080 feet supl. of ashler in each pier below water, at Id. 3110 0
To 1176 ditto above water, at 8<& - - - 39 4 0
The whole pier in solid contains 467 cube yards, includinglabour, carriage, tarras mortar, six inches in the outsidejoints, and all materials, at 5s. per yard - - -116150
N. B. The ashler being at least 20 inches bed, and cubedinto the solid, at 5s. per yard, is supposed to pay for thetarras mortar and extra labour in setting thereof.
To capping the pier with solid blocks, jointed between the
springer stones, 600 cube feet, at 6d. - - -15 0 0
To capping the ends of the piers, 148 feet supl., at 8 d. - 4 18 0
To six piers and two abutment piers, each reckoned as a pier,
that is No. 8., at 207/. 7s. 8 d. - 1659 1 4
To walling in the west land stool, to bring it up to thespringers to be at a medium 5 feet thick, containing 490cube yards, at 5s. - - - - - 122 10 0
To hammer-dressing that part of the wall that comes in view
below the plinth, containing 666 feet supl., at l£d. - 4 3 3
To working the plinth, being before reckoned as solid, con-taining 990 feet supl., at 3 d. - - - - 12 7 6
To 78 cube yards of masonry, in the east land stool, to bring
it up to the height of the springers, at 5s. - 19 10 0
To setting under the west abutment arch, to prevent the
water from affecting the foundations, 1353 feet at 4 d. - 22 11 0
544 8 0
Masonry in the piers, and abutments below the springing of the arches - 1840 3 1
Centering for the arches.
To timber in one rib 416 feet cube, and for six ribs - 2496 cube ft.
To timber in 30 bearing piles and 5 capt-trees, for supporting
the ribs ------- 750
To stays and bracings between the ribs to keep them upright 75
To covering for the centres in square scantlings - - 525
To additional work to make the centres fit the large arches - 188
To timber in a centre complete
4034 at 3s, 605 2 0
To iron work in the six ribs, 1852 lbs. at 5d. - - £38 11 8
To ditto in pile shoes and hoops, 662 lbs. at 5d. - - 13 15 10
To spikes, nails, and other contingent articles - - 5 0 0
The iron work for one centre - - _ -
One centre complete - - - _ .
To a set of piles and cap pieces, ready prepared for driving in the secondarch before the first centre is struck, containing 750 feet, at 2s.
To 5 booms, containing 375 feet of timber, at 2s., to be fixed as strutsbetween the piers of the second arch while the centre is taking downfrom the first and putting up in the second -To taking down the centre, drawing the piles, driving ditto, and settingup the centre 6 times, repairing and making good what is wanting, at9 d. per cube foot upon the timber, which being 4034 feet, comes to151/. 5s. 6d. each time, and for 6 times -
Taking down and putting up the booms 5 times, at 6d. per footTo centering for one of the small arches, at 20s. per squareTo taking down, removing, and setting up ditto in the other arch
Centering for the bridge complete «... -
57
7
6
662
9
6
75
0
0
37
10
0
907
13
0
46
17
6
20
0
0
5
0
0
1754
10
0