222 ACTUAL COSTS AND CAPACITY OF GASWORKS. 



ammonia, and also extract a considerable proportion of 

 the carbonic acid and sulphuretted hydrogen. On this 

 basis, the scrubbing plant is equivalent to a daily capacity 

 of 120,000 cubic feet, or 24,000,000 cubic feet per annum. 

 Cost of scrubber, including foundations and all accessories, 

 ^265. 



Foundations. Sketches are given of the foundations pro- 

 vided for condensers, scrubber and purifiers (Fig. 26). 



Purifiers. These are of the luteless type, four in number, 

 5 feet deep, and are arranged with a series of eight 

 valves, 9-inch, fixed in one box above the centre (Figs. 

 27 to 30). Each valve is fitted with a wheel and suitable 

 indicator. After the site had been excavated to the neces- 

 sary depth, a concrete foundation, 9 inches thick, was 

 made. Each plate is J inch thick, with flanges 3^ inches 

 wide, J-inch thick, and bolted together with f inch bolts 

 at 6-inch centres. A strengthening bracket is also cast 

 between each bolt, \ inch thick. ' The flanges are all 

 planed, and stand 2f inches clear of the plates. On the 

 inside, two tiers of snugs are prepared to receive the tee 

 steel bearers, and upon the end plates two rows of con- 

 tinuous ribs, i J inches broad and | inch thick, to carry the 

 wood grids, these being bracketed underneath at 1 2-inch 

 centres. On the outside of each plate is cast a suitable 

 moulding. Each purifier is fitted complete with two tiers 

 of tee bars, of 3-inch by 4-inch by |-inch steel, and two 

 tiers of grids, of well-seasoned timber, with taper deal bars 

 and oak sides, and securely bolted with f-inch bolts. 



The covers are formed of an angle steel frame, 5 inches 

 by 3 inches by f inch, stiffened with two lines of 5-inch 

 by 4-inch i3-lb. bulb tee, securely riveted to the 

 plating with J-inch rivets, 6-inch pitch. The plates are 

 \ inch thick, lap-jointed and single-riveted, with J-inch 

 rivets, i|-inch pitch, ij-inch lap. Eyes are bolted to bulb 

 tees, for lifting the covers. A 3-inch diameter taper plug 

 and seating, with test tap, is fixed into each lid, as air 

 valves. 



The lifting arrangement is formed of two lo-inch by 

 5-inch steel joists, fixed on four cast-iron columns, and 

 fitted with two sets of travelling carriages and pulley 



