So′da-fountain.
A vessel for containing sodawater or water charged with carbonic-acid gas under high pressure, and provided with pipes and valves for drawing it off as required.
Sodafountains are usually made of copper, and should be lined with silver to prevent corrosion.
Steel is also employed.
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Soda-fountain. |
Fig. 5274 illustrates a simple apparatus for generating the gas and charging the fountain.
The generator
a b consists of two parts communicating by a valved opening.
The lower part is partially filled with chalk or other nearly pure carbonate of lime, the upper with sulphuric acid.
On opening the valve by turning a small hand-wheel, the acid is brought in contact with the chalk, which it decomposes with the evolution of carbonic-acid gas; this is passed through a purifier
c containing some material which will remove any deleterious matters from the gas, and provided with a gage
d, which indicates the degree of pressure in the vessels.
The carbonate is kept in motion by a rotary stirrer
e, and when the desired pressure is attained, the cock
f is opened, permitting the gas to flow into the fountain
g, which has been previously partially filled with water, in which a small quantity of soda is, in some cases, dissolved.
Pure water is, however, usually employed, and a flavoring sirup added when the fluid is drawn.
See fountain, Fig 2086, page 911.
Fig. 5275 is a portable arrangement for village or picnic use, in which the aeration of the water is produced by the action of acid on an alkali in a chamber near the nozzle The pumpcylinder is guarded by a perforated partition from the icechamber.
The water is forced by a piston to the main pipe, the delivery ends of which are respectively a nozzle for plain icewater, and a nozzle in which an effervescent powder lies upon a perforated diaphragm in the discharge-cup.
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Soda-fountain. |
In
Fig. 5276, the soda-water passes through the annular space between an ice-chamber and an outer case containing some nonconductor of heat.
Discharge-faucets communicate with the soda-water reservoir and the ice-chamber.
See soda-water Ap-Paratus.
