EXAMPLES OF TIMBER W HARPING. 



'59 



FIG. 140. 



so deeply in the recesses at the back that whole-timber 

 sheet-piles had to be driven behind the jetties to retain 

 the mud, in order that the soil between the piles might be 

 excavated to enable the braces to be fixed at as low a level as 

 possible. 1 



A design adopted by Mr. W. Dyce Cay, at Aberdeen, com- 

 bining a pitched slope with a 

 timber wharfing, is shown by 

 Fig. 140. 2 



Queen's Quay, Belfast. The 

 construction of the Queen's Quay, 

 Belfast, which is 2150 feet long, 

 is shown by Fig. 141. The bear- 

 ing-piles, of pitch-pine 12 inches 

 square, are 48 feet long in the 

 front row, in the centre row 43 

 feet, and in the back row 40 feet, the front and back piles being 

 braced together by diagonal timbers 12 inches by 6 inches. 

 Longitudinally the piles are spaced 6 feet apart centre to centre. 

 The spaces between the 

 piles of the front row 

 are filled in with close 

 sheeting of American 

 elm, 37 feet long by 11 

 inches in thickness. The 

 platform consists of tim- 

 ber joists 12 inches wide 

 by 6 inches thick, sup- 

 porting close planking 

 6 inches thick, covered 

 with a layer of bitumen 

 and paved with stone 

 setts. 



The back row of piles 

 was close planked with Fu;< Hl - 



4-inch timber, and the back filled in with light material. The 

 space between the front and back rows of piles is filled and 

 formed to a slight slope, and pitched with square setts. The 



30 



' M.P.I.CK, vol. xcii. p. 153. 2 Ibid., vol. xcii. p. 178. 



3 Ibid., vol. Iv. p 34. 



