DOCK GATES. 



243 



FIG. 233. 



FIG. 234. 



FIG. 235. 



The horizontals or longitudinal angle-irons are each in one 

 length of 35 feet 3 inches, and of 3J inches by 3J inches by 

 i inch. Those at the bulkheads or vertical bracing are of 

 3J inches by 3J inches by J inch, welded and bent so as to form 

 a continuous ring, and juggled where necessary. The frames 

 are 3 inches by 3 inches by | inch, spaced about 1 foot 10 inches 

 apart, and in lengths 

 of about 3 feet 5 

 inches, 3 feet 5 inches, 

 5 feet 8 inches, and 5 

 feet 8 inches respec- 

 tively. The angle-irons 

 securing the green- 

 heart meeting - faces, 

 etc., are of 3J^ inches 

 by 3 J inches by J inch, 

 bent at corners, and 

 having countersunk 

 holes for bolts. 



Alexander Dock, 

 Hull. Figs. 233 to 235 

 show the construction 

 of the entrance gates; 

 the material is green- LW.O 

 heart throughout; in 

 form they are seg- 

 mental with .a rise of 

 about 14 feet. 5 Each 

 leaf is constructed in 

 three panels and is 

 supported on a roller 

 which travels on a 

 cast-steel roller-path of 

 39 feet 6 inches radius 

 accurately bedded on granite blocks. The weight of one leaf is 

 176 tons. 



Havre Dock Gates. A form of gate-caisson l designed by Mr. 

 D. Cunningham, M.I.C.E., is fastened at one end to the masonry 

 of the dock entrance, and on being opened is swung round into 

 a recess in the side wall in a similar manner to one leaf of an 



M.P.I.C.R, vol. Ixv. p. 338. 



