COST OF DOCKS. 361 



Per foot Per cubic 



run. yd. internal 



capacity. 



, s. d. & s. d. 



Locks. Granite invert; lower altars Portland stone ; upper 

 altars Portland stone capped with granite; granite 

 broad altars ; slides, slips and coping ; brick and con- 

 crete backing. No timber in the foundations. Mean 

 depth to the floor 47 feet 8 inches. Approximate cost 263 00 1150 





 Alexandra Docks, Hull. 1 Including pumping machinery, stone and concrete, 



cost per foot lineal 105 



Esquimalt Dock. 2 Constructed of concrete, brickwork, and btone, and in- 

 cluding cost of coffer-dam, caisson and chamber, engines, pumps, boilers, 

 and buildings, etc. Total length from coping line at entrance to back of 



work at head about 506 feet 370 



Glasgow, No. 2 Dock. 3 Constructed entirely of concrete, on concrete- cylinder 

 foundations. Total length from coping line at entrance to back of work 

 at head about 625 feet 160 



Walls and Piers Liverpool Docks. Cost of masonry in the ordinary . d. 

 run of dock walls, consisting of rubble stone set in lime mortar 

 (per cubic yard) from 18s. to 100 



Ditto, about the entrances, including all especially dressed work in 



hollow quoins, and sills (per cubic yard) 4 from 25s. to 170 



Greenock. Sea-piers, with facing of cast-iron piles and stone blocks, 

 backed with concrete deposited through the water at low tide. 

 Upper portion of work composed of freestone facing and rubble 

 backing, walling of rubble stone, finished with granite coping 

 and causeway. Total width of pier 60 feet; walls 33 feet in 

 height, 11 feet 6 inches at the base, and 5 feet at the top. 

 Estimated cost (per lineal yard) s 157 10 



Quay Wall at the Mouth of the Rhone. Concrete blocks fixed in place 



cost (per cubic yard) 18 6 



The total cost per lineal yard, including dredging, staging, and pro- 

 visionally loading the concrete wall with concrete blocks before 

 adding the superstructure a precaution usually adopted in 

 similar structures by French engineers, to guard against ultimate 

 settlement 6 48 



Alexandra Dock, Hull. Cost including foundations for coal-hoisting 

 gear, and subsidiary works round walls. Height of walls ranging 

 from 52 to 62 feet (per lineal yard) 7 84 



Calais Harbour Wharves. The total cost of sinking the foundation 

 blocks, finished complete, including the purchase of pumps and 

 all materials and labour, per cubic metre, about 3s. 3d. ; or, per 

 cubic yard 8 . 043 



Queen's Dock, Glasgow. 9 Cost of basin walls per yard lineal, on 

 concrete cylinders, superstructure of freestone ashlar facing, in 

 courses ranging from 15 to 18 inches in thickness, 2 feet on the bed, 



1 M.P.I.C.E., vol. xcii. p. 176. * Engineering, vol. xliv. p. 3i)0. 



3 Ibid., vol. xlii. p. 566. 4 M.P.LC.E., voL c. p. 74, 



8 Ibi /., vol. xxii. p. 427. Ibid., vol. Iv. p. 106. 



1 Ibid., vol. xcii. pp. 175-176. 8 Engineering, voL xlvii, p. 578. 



' " Description of Queen's Dock," Mr. J. Deas, C.E. 



