The latter is filled with cages
containing carbide, which is attacked by the water rising in the chamber.
The gas evolved passing into and raising the bell of the gasholder causes
the open end of the swivelled pipe to rise, through the weight of the
counterpoise _G_, above the level of the water in the tank and so
cuts off the supply of water to the generating chamber until the bell
again descends and depresses the swivelled pipe. The tappet on the bell
also displaces a cap _H_ which covers the funnel-shaped mouth of the
pipe leading to the generating chamber, which cap, except when the
swivelled supply-pipe is being brought into play, prevents any extraneous
moisture or other matter entering the mouth of the funnel. Between the
generating chamber and the gasholder is a three-way cock _J_ in the
gas connexion, which, when the gasholder is shut off from the generator,
brings the latter into communication with a vent-pipe _K_ leading to
the open. The gas passes from the holder to a chamber _L_ under
grids packed with purifying material, through which it passes to the
outlet of the purifier and thence to the service-pipe. Either heratol or
chloride of lime is used in the purifier, the lid of which, like the
cover of the generator, is water-sealed.
Pages:
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761