The mixing fans sweep every particle of whiting off the bottom, carrying it upwards without the possibility of either escaping the other; hence the great economy of this generator, as all gas contained in the carbonate must be evolved.

The frictional part of the spindle, working in the stuffing-boxes of the generator, which carries the fans, is covered with a stout silver tube on each end, so that it is not affected by the acid; the agitator rod runs right through, and is supported on the outside, so that the wear is not on the packing of the stuffing-boxes.

Fig. 69.   Vertical Generator with Horizontal Agitator

Fig. 69. - Vertical Generator with Horizontal Agitator.

The inlet at top is made of gun-metal, and is easily opened by a slight turn of the handle, although very secure when fastened.

The outlet at bottom is a convenience, it being a sliding valve, and the killed whiting and acid, instead of coming out with a splash, as is the case with the screw cap, may be let out gradually. It is easily closed again for re-charging.

There is also a great advantage in having the generator this shape for cleaning out, as it can be thoroughly cleared of every particle of foreign matter, it all falling towards the bottom outlet.

The body of the generator is well and substantially supported under its top flange on the cast iron ring of the framework, and also at its bottom part on the four iron brackets, which are secured by bolts to the legs.

The bottom part is joined to the body by a circle of bolts and nuts, and is easily disconnected for repairs to the agitator, thus allowing the only part liable to derangement to be easily got at, as the mixing fans also come away with it.

This vertical generator is fitted for hand or power, made in different sizes, contents from 25 to 350 gallons, size of body from 2 ft. 9 inch to 7 ft. 0 inch long and 1 ft. 6 in. to 3 ft. 6 in. diameter, including the acid i syphon box, and fitted with necessary connections.

Fig. 70.   Dial Pressitre Gauge

Fig. 70. - Dial Pressitre Gauge.

Fig. 71.   Water Gauge

Fig. 71. - Water Gauge.

The pressure-gauge here shown is appended to the carbonating machines described heretofore. It is a useful and necessary appendage. "With the dial in sight, the pressure can always be kept at the point desired, thus the pressure in the bottle is uniform, as every variation is instantly visible, the index hand being very sensitive.

The water-gauge is another useful appendage to the soda-water machine. It consists of a vertical glass tube, the ends of which are fixed perfectly tight in brass sockets, the lower one being attached to the bottom of the condenser, and the upper one to the top, in such a manner that the water and the gas have free access to the tube. It follows that as the gas and water are pumped into the condenser, the water will rise in the glass tube to the same level; as the pressure within the condenser and the tube is the same. The object of the water-gauge is to enable the bottler to see the height of the water in the condenser, which should always be about three-fourths full. In large machines the water-gauge is almost indispensable, particularly in the double ones with large-sized condensers, and those with large-sized copper cylinders, as it requires some time to charge them in first getting up the pressure: and it is important to know that the requisite quantity has been pumped in before beginning to bottle, and also to see that the same is maintained during the whole time the soda water is being drawn off.

In the catalogue of Barnett & Foster, London, is to be found "Foster's patent arrangement for generating carbonic acid gas automatically and direct from the carboy," and it is claimed that by means of which at least 30 per cent. of acid and labor is saved, besides the advantage of extreme cleanliness and safety.

Fig. 72.   Foster's Patent Arrangement for Generating Carbonic Acid Gas

Fig. 72. - Foster's Patent Arrangement for Generating Carbonic Acid Gas.

We append a cut with a description, being interesting to the trade.

The object of the above arrangement is to make carbonic acid gas economically and automatically, and also with extreme safety, as it is made in small quantities as required.

The generator, F, has first to be charged with whiting, through the inlet, C, and then water to be run in till generator is about half full. Acid is now drawn from A into measure, H, about same quantity in weight as whiting in generator. The acid cock, I, may now be turned on, when the acid will run into generator and cause the gasometer bell, P, to rise, the generator being driven by power continuously; the lever of acid cock should be put between the two knobs, JJ; now, as the bell, P, falls by the suction of the pumps of the soda-water machine it will cause the two knobs, J J, to rise, and thus raise or "turn on" the handle of acid cock; the acid falling into generator, F, will cause the bell again to rise; this automatic action will continue till the acid is all out of measure, H, when the bell, P, will lower and the wedge, L, will travel on to the push-piece, M, which will cause the electric bell, N, to ring. There will be sufficient gas in the gasometer for the soda-water machine to continue working while a fresh charge of acid and whiting are being supplied. The arrangement of automatic gas supply, as shown above, can be adapted to existing manufactories.

Another arrangement in conjunction with a carbonating apparatus, found in the same catalogue, is illustrated by the next cut. The object of this arrangement is to measure the quantity of sulphuric acid against the carbonate put into the generator, by which means waste is prevented, and the full amount of carbonic acid gas may be abstracted from the carbonate.