For when the aperture of the partition plate would admit more gas than what is necessary for the density of the gas in the mains, the floating regulator rises, and by that means raises the adjusting cone to diminish the aperture in the partition plate, and when, on the contrary, the aperture does not allow a sufficient quantity of gas to come from the gas holders, the gas passes out of the regulator into the mains, and in so doing the regulator descends, and consequently the adjusting cone increases the opening to admit the requisite gas into the mains.
The further application of this machine, for regulating the height of the gas flames issuing from burners or lamps of different kinds will be shewn hereafter.
_Gas Holder with Governor or Regulating Guage at the Gas Works Chester._
Fig. 7, plate VI., exhibits a perpendicular section of the gas holder at Chester. A, A, are wooden beams or pillars fixed into sockets or shafts constructed on the outside of the brick-work, and descending as seen in the design to the depth of the tank. There are four of these pillars, three only are seen in the section. B, B, are round iron guide rods rendered steady by stays at the upper extremity of the rods.
To the upper and lower edges of the gas holder are fastened eye bolts, C, C, through which the guide rods, B, B, are inserted, so that the gas holder must move steadily and firmly. D, E, are the inlet and outlet pipes which convey the gas into and out of the gas holder.
F, F, are diagonal stays for supporting the roof of the gas holder, which has a slope of ten feet from the centre to the circumference. G, is the wooden curb at the lower margin of the machine.
This gas holder is circular. It measures forty-eight feet in diameter, and thirteen feet in height; its weight is eight tons.
The regulator adapted to this gas holder, measures three feet across its base, and its height is three feet three inches. The base of the regulating cone is four inches, and its length two feet. The machine is made of sheet iron japanned within and without.
_Gas Holder with Governor or Regulating Guage at the Birmingham Gas Works._
The construction of this gas holder, as exhibited plate V., fig. 2, shows a perpendicular section, and fig. 3, a plan of the machine; _a_, _a_, _a_, _a_, fig. 3, are upright pillars, two of which B, B, are seen in the section, fig. 2.