This section is from the book "A Treatise On Beverages or The Complete Practical Bottler", by Charles Herman Sulz. Also available from Amazon: A Treatise On Beverages.
This is what might be called a decidedly new feature in carbonating. Of course it is well known that carbonic acid gas has long since been liquified under pressure, but it has remained for our time to apply it practically for commercial purposes in making soda water. We hear that it has met with some success, and the parties using it speak well of it as a practical carbo-nator. We will give the reader the fullest information we have concern-ing the new candidate for public favor. The whole process is very simple, and accompanying cuts clearly explain the application of the liquid acid.
Fig. 210 indicates the manner in which the flask of "liquid carbon-ate" is attached to the mixing-cylinders. The trouble encountered from the contents of the flask freezing up - from its too rapid exhaustion - is overcome by attaching several flasks to one set of mixing-cylinders, and regulating the flow by a reducing valve.
Fig. 211 shows the method followed in charging portable fountains, and the same precautions against freezing can be adopted if the work must be accomplished rapidly and in a limited time. Any style of car-bonating apparatus can be readily adapted for using the gas.
Fig. 210. - Liquid Carbonic Acid Cylinder Attached to Stationary Fountains.
The manner of carbonating beverages is very plain. The illustrations show the cylinders containing the compressed carbonic acid gas. After the necessary connections to these cylinders have been applied, as shown in cuts, all that is necessary to obtain the desired amount of gas for immediate use is to open the valve on top of the cylinder, when, by turning slowly, the gas will stream through the connecting tube into the fountain containing the water or other liquid and fill the same with gas, which, by agitation, is rapidly absorbed by the water, etc. The gauge, as shown in illustrations, indicates the pressure. Therefore, when the liquid in the fountain ceases to absorb the gas, which may be known by the gauge remaining stationary at the required pressure, after a thorough agitation the operation of carbonating the liquid is completed. With the proper connections any number of fountains may thus be charged.
Aside from the pressure gauge an automatic pressure governor is recommended for attachment, as shown in illustration, Fig. 212. This governor allows the gas to enter the fountain or other suitable vesse. until the pressure in them has reached the point wanted, when it will close automatically; the pressure being controlled by turning the screw E either way, as may be required. It will thus be seen that, especially for bottlers' use, this patent automatic pressure governor is of vast benefit, as it gives a uniform pressure in every bottle filled. It can be set from 0 to 200 lbs and can be handled and controlled with ease. 20
Directions for operating: - "Fasten the bracket, holding the automatic pressure governor on to the wall, and connect the cylinder C with the governor A by means of coupling D. As a washer use one of the small round pieces of felt furnished; use it just as it is, as the gas will force itself through. Connect the rubber tube to the fountain containing the liquid to be carbonated. Lay the fountain on the rocker and open fountain cock. Loosen the hand wheel on governor by turning from right to left (until it works quite freely). Open main valve B by turning hand wheel G from right to left (as far as possible). Set gauge at the point at which pressure is desired by turning the hand wheel E on governor from left to right. Open cock F and the gas will immediately be carried through the rubber tube into the fountain containing the liquid. Now keep up a constant agitation by rocking the fountain. It will be found that during this agitation the indicator on gauge will recede; however, this does not matter. Keep up the agitation and it will be found that the indicator on gauge will gradually work forward, and when the pressure point, at which the gauge was originally set, is reached, close the cock F and shut off the gas by turning hand wheel G from left to right. This completes the operation of carbonating the liquid and it is ready for use".