The carbide used is
granulated or of uniform size. In the generating chamber _B_ is an
annular float _E_, nearly filling the area of the chamber, and
connected, by two rods passing, with some lateral play, through apertures
in the conical bottom of the feed chamber _C_, to the T-shaped
tubular valve _F_. Consequently when the float shifts vertically or
laterally the rods and valves at once move with it. The angle of the cone
of the feed chamber and the curve of the tubular valve are based on the
angle of rest of the size of carbide used, with the object of securing
sensitiveness of the feed. The feed is thus operated by a very small
movement of the float, and consequently there is but very slight rise and
fall of the water in the generating chamber. Owing to the lateral play,
the feed valve rarely becomes concentric with its seat. There is a cover
_G_ over the feed valve _F_, designed to distribute the carbide
evenly about the feed aperture and to prevent it passing down the hollow
of the valve and the holes through which the connecting-rods pass. It
also directs the course of the evolved gas on its way to the service-pipe
through the carbide in the feed chamber _C_, whereby the gas is
dried.
Pages:
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709