SODA.— Hydrochloric Acid Towers.

799

“ Newall jet,” connected to a water supply at a highpressure, and which not only assists the condensa-tion, but also improves the draught. Fig. 10 showsthe arrangement of condensers where great care wastaken to prevent escape, and where the weak acid fromthe last towers, which stood about 5° or 6° Fahr.,was pumped up to the top of the other condensers,and used in the place of water. In this way all theacid produced was utilized, and no acid was allowedto run into the neighbouring stream or river, fre-quently causing nuisance and damage.

Fig. 11 also shows condensers, which can be usedeither for the gas passing from the pan or from thefurnace, and where the usual application of water isin operation.

Fig . ll.

condenser, a, is connected with the pan, and has acooling pipe in all about 150 feet long, and is packed

Fig. 12.

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Fig. 12 gives condensers suitable for a pan and fur-nace working about 8 cwts. of salt per hour. The

with hard burnt coke. B is con-nected with the furnace or drier,and is packed with bricks, and isworked with an open furnace ; thecooling flue (not shown in plan) isabout 100 feet long.

It may now be interesting tocompare the condensing apparatusgenerally adopted in France . Inthe first place, the weight of salt forthe daily charges is much smallerthan in this country, and it isworked off very slowly, with the object of securinga complete condensation of the hydrochloric acid.