206 ACTUAL COSTS AND CAPACITY OF GASWORKS. 



constructed 2 feet wide by 30 feet long, as shown. The 

 principals are formed of 3j-inch by 3j-inch by ^-inch 

 T-steel, with tie rods and diagonals, 3-inch by J-inch flat, 

 and 3-inch by 3-inch by J-inch T-steel, respectively. To 

 the 2-inch by 2-inch by |-inch angle steel purlins of the 

 roof are secured ij-inch by ij-inch wood purlins, with 

 f-inch bolts. To these are fastened, with copper nails, 

 Welsh seconds slates, laid with 4-inch lap. Along the 

 ridge at each end of ventilator blue Staffordshire tiles are 

 laid. Upon each gable a course of 1 4-inch by 3-inch 

 tabling is firmly laid. Inclusive cost of retort house and 

 roof, j4o- 



Retort bench. The retort bench consists of three arches, 

 but only two are completed, each having six retorts, and 

 regenerative settings. Over the whole of the area, and pro- 

 jecting 12 inches beyond, a foundation of 12 inches of 

 concrete was provided. The regenerative portion extends 

 for a distance of 8 feet from the retort house floor level to 

 the top of concrete foundation. The two filled arches are 

 7 feet 9 inches and the empty one 8 feet 6 inches wide, 

 and ii feet 7 inches from front to back. The inside pier 

 walls are i foot 6 inches, and the end walls 2 feet 3 inches 

 thick. Only fire-bricks of approved quality were used, 

 except above the two 4^-inch rings which form the arches. 

 The twelve retorts are 22-inch by 1 6-inch by lo-feet, 

 Q -shaped. 



Upon a concrete foundation, 3 feet thick, and projecting 

 12 inches on each side, a chimney is erected, outside the 

 retort house, being connected to the main flue through an 

 arch left in the retort house wall for that purpose. There 

 is a cleaning-out door in the base of the chimney. The 

 barrel of the chimney is 2 feet 3 inches square, the walls 

 being 14 inches thick, of which 4^ inches on the inside 

 is composed of fire-bricks, the remainder being good 

 quality red bricks. The inside headers are of fire-bricks. 

 The fire-bricks and red bricks were selected so as to be as 

 nearly as possible of the same size. The height of chimney, 

 from top of foundation, is 45 feet 6 inches. 



At the front of the bench a subway is formed, 7 feet 

 wide, and extends the full length of the retort house 



