2 3 



ACTUAL COSTS AND CAPACITY OF GASWORKS. 



holder. There are six pairs of strong cast-iron carnages and 

 rollers, working in turned steel axles. The rollers are turned, 

 bored, grooved, and prepared with oil holes. A hand-rail, 

 consisting of two rows of f-inch wrought-iron, is passed 

 through holes in fifteen uprights of 2j-inch by 2|-inch by 

 T Vinch angle iron, the hand-railing being i foot 6 inches 

 and 3 feet, respectively, from the top curb. In the bottom 

 of the tank are provided twelve cast-iron rest blocks, 



Fig- 37. Gasholder and Tank. 



6 inches deep, for the holder to rest upon when out of 

 action. Two steel joists are placed across each of the 

 recesses provided for inlet and outlet pipes, which are 

 9 inches diameter, fixed at right angle centres, so that gas 

 passing up inlet is thoroughly diffused before passing down 

 outlet. Syphon pots, with f-inch pump pipes, are pro- 

 vided to each pipe, and each pipe is stayed with 2j-inch by 

 2 J- inch by f-inch angle iron, secured to the bottom with 



