ACTUAL COSTS AND CAPACITY OF GASWORKS. 2JI 



two 3-inch by 3-inch by f -inch angle irons, 9 inches long, 

 and J-inch bolts. 



Gasholder. The dome-shaped crown rises 3 feet to the 

 centre. The materials and strengths of the inner lift are as 

 follows 



rows of sheets, top and bottom of 12 S.W.G., and inter- 

 mediates of 14 S.\Y.< ;. 



Top curl) \\ inches by 3-J inches by J inch, with 



steel joint covers, iS inches long. 



Six main vertical stays, of 8-inch by J-inch steel plate, and 2$-inch 

 by 2j-inch by ^-inch steel angles, riveted together, and bolted to the 

 .ad bottom curbs, and in the centre to the spiral plate. 



Six intermediate vertical stays, of 4-inch by 4-inch by 8-inch tee 

 atached to top and bottom curbs. 



Six spiral plates, 4-inch steel, 12 inches wide, riveted to sides with 

 | -inch rivets, and to which are fixed guides of steel rail, weighing 

 4 1 Ibs. per yard, and surmounted with cast-iron cap. 



Centre crown sheet of ^-inch plate, outside row of 12 S.W.G., and 

 five intermediate rows of 14 S.W.G. 



Two oval manholes, fitted with ^-inch flat cover stiffening ring, 

 and set screws. 



Crown plate, -fa inch thick, 4 feet diameter, with flat ring under- 

 neath, 3^ inches by inch, between which and the plate the ends of 

 the main bars are bolted. 



Centre pipe, 8 inches diameter, of cast-iron, g-inch metal, with 

 strong bracketed flanges at each end. To the lower end of the pipe is 

 bolted a cup, 8 inches deep. 



Twelve main bars of 3-inch by 3-inch by |-inch steel tees, 

 trussed with f-inch diameter tension rod and i-inch diameter strut. 



One ring of 3-inch by 3-inch by g-inch angle steel bars, with 

 ends turned and bolted to main bars. 



Twelve 3-inch by &-inch flat steel secondary bars, bolted to cross- 

 l>ars and top curb. 



Three concentric rings of 2-inch by 2-inch by i-inch angle steel 

 bracket bars, with ends turned, and bolted to main and secondary 

 bus, 



Six main tension rods of i i-inch bar steel, bolted to gussets at the 

 curb and to centre pipe, with enlarged screw ends and double nuts. 



Six pairs of double gusset plates, 8-inch by J-inch, connecting 

 main bars and vertical stays together. 



Hydraulic cup, of 7-inch by 2J-inch rolled steel channel, with 

 8 gauge skirting plate, 16 inches deep, stiffened at upper edge 

 with 2-inch by g-inch flat strip. 



The materials and strengths of the outer lift are as 

 follows : 



