214 ACTUAL COSTS AND CAPACITY OF GASWORKS. 



are complete with 9-inch connections, two 9-inch disc 

 valves, one g-inch rack valve, and by-pass. The tubes are 

 of T Vinch steel plates, the outer tubes having vertical lap 

 joints and horizontal butt joints, with cover straps, 4^ inches 

 by \ inch. All the joints of the inner tubes are lapped. 

 Cast-iron mouldings of heavy design connect the inner 

 and outer tubes at the top and bottom, respectively. 

 Each condenser is provided with saddle branches, 9 inches 

 diameter, 5 inches by 3 inches rectangular opening tapering 

 to 3 inches diameter for tar outlet, and cleaning-out doors 

 fitted with cross-bar, screw and lug. Each tar pipe or 

 outlet is bolted to a drop pipe, 3 inches diameter, sealing 

 in a pot, 12 inches diameter by 18 inches deep, the pots 

 being coupled to each other, and one provided with over- 

 flow socket for connecting up with tar well in the usual 

 manner. A wing valve, mounted on a spindle, and fitted 

 with hand wheel in front, is fitted at the bottom of each 

 inner tube, for the purpose of regulating the quantity of air 

 passing up. Two dial thermometers are fixed, one in the 

 inlet and another in the outlet pipe. 



These condensers provide 900 square feet of condensing 

 surface. The 9-inch foul main from hydraulic to con- 

 densers gives a further 230 square feet. Taking as the 

 required capacity the generous factor of 7 square feet per 

 thousand cubic feet of gas made per diem, the total con- 

 densing area is equal to a daily make of 160,000 cubic 

 feet, or 32,000,000 cubic feet per annum. Cost, including 

 excavation and foundations, 122. 



Exhauster house. The dimensions of this building are 

 14 feet by 1 8 feet 6 inches by 8 feet to eaves. A founda- 

 tion of concrete, 9 inches thick and i foot 6 inches wide, 

 is formed under the four walls, with one footing course of 

 bricks, 14 inches wide. The walls are 9 inches thick. The 

 roof is of wood, and covered with Welsh slates (seconds), 

 surmounted with Staffordshire blue ridge tiles. The floor 

 is boarded, and provision made for ready access to all the 

 connections, gas, steam, tar, etc. Sketches of the building 

 are given in Figs. 14 to 18. Cost of house complete, 54. 



Exhauster. The exhauster is of the rotary type, steam 

 driven, and is capable of passing 7,500 cubic feet per hour, 



