ACTUAL COSTS AND CAPACITY OF GASWORKS. 2OJ 



space between the bench and the gable wall was excavated, 

 and covered with steel girders, 8 inches by 6 inches, and 

 concrete floor. In the empty arch, a g-inch wall is built 

 of fire-brick for a height of 12 feet from the concrete, to 

 act as a stiffener, when the two complete settings are at 

 work. The subway wall is formed of red brick, 14 inches 

 thick The eight bearers for subway roof are 6-inch by 

 5-inch steel joists, covered in with f-inch steel chequer 

 plates, the outside plates being fastened with countersunk 

 bolts, and the centre plate in front of each setting left 

 movable, for clinkering purposes. The contractor pro- 

 vided a rail in the subway floor and a corve, 3 feet by 



2 feet by i foot 6 inches, for the purpose of elevating 

 clinkers from the subway to the retort house floor level. 

 For elevating these, Morris and Bastard's patent blocks, 

 to carry 10 cwts., and a steel joist, 6 inches by 5 inches, 

 fixed into the retort house wall, and projecting n feet 

 6 inches into the retort house, were supplied. A ladder, 

 for access to the subway, is also provided. 



The four front and four back buckstays are 8 inches by 

 6 inches, carried to the bottom of the bench, and fixed in 

 cast-iron shoes, firmly bolted to the concrete. The six end 

 buckstays are 10 inches by 6 inches, and secured in a 

 similar manner. Flat eyes are riveted at the top ends, to 

 receive the three ij-inch diameter tie rods, which are fitted 

 with coupling boxes. The four cross girders are 6 inches 

 by 5 inches, of H-steel section, drilled at each end, and 

 secured to the buckstays with angle-iron brackets. The 

 mouthpieces are self-sealing. The ascension pipes, bends, 

 arch and dip pipes are 6 inches diameter and inch thick. 

 The hydraulic main is formed of mild steel plates and 

 angles, 22 inches by 22 inches, U-shaped, the bottom being 

 J inch thick, the top and end plates f inch thick, the top 

 angles 3 inches by 3 inches by j inches, and the end angles 



3 inches by 3 inches by J-inch, with butt straps of 4^ 

 inches by f-inch flat, all riveted up with f-inch diameter 

 rivets, 2-inch pitch. In each section, two handholes are 

 provided, for cleaning. Cast-iron stands support the 

 hydraulic main from the cross joists. The foul main 

 is g inches diarre'er, and fitted with sepa:ate valves 



