. The American journal of science and arts . s their re-moval. They are charged with the white sulphate of iron, by themeans of the spoon represented. The recipient is then adapted andthe whole luted, with a mixture of saw dust and clay. In this statethe gallery is heated; wood is the combustible employed ; the fire iskept up for twenty four hours. The charge for each:retort is 2 128 lbs. for a gallery, giving from 70 to 79 lbs. of smoking sul-phuric acid. This result is not constant; frequently much less isobtained. To obtain a like product the wood should be dry and thefire well condu
. The American journal of science and arts . s their re-moval. They are charged with the white sulphate of iron, by themeans of the spoon represented. The recipient is then adapted andthe whole luted, with a mixture of saw dust and clay. In this statethe gallery is heated; wood is the combustible employed ; the fire iskept up for twenty four hours. The charge for each:retort is 2 128 lbs. for a gallery, giving from 70 to 79 lbs. of smoking sul-phuric acid. This result is not constant; frequently much less isobtained. To obtain a like product the wood should be dry and thefire well conducted, otherwise on inspection, some of the retorts willbe found to contain a weak acid and in less quantity. Those of therecipients which contain a weak acid are known by their not smo-king ; it is distributed in this state, by piece-meal, into the other pro-ducts. The twenty four hours having expired, the fire is suffered tofall; when sufficiently cool, the lute that attaches the recipient to the JVotice of the Smoking Sulphuric Jlcid. 349. Vol. XX.—No. 2 350 On the Refraction of Light. retort is broken,* and the acid thrown into large stone ware jars andthus sold. The colcdthar is extracted from the retorts by means ofthe scraper; it is of a dark red color, having occasionally a yellowishhue, which indicates but a partial decomposition. This oxide is sentback to Goslar, where it is manufactured into ochre. Those of theretorts that are no longer fit for service are replaced. Twenty fourhours suffice for collecting the acid, and making the necessary prep-arations for a new operation. The quantity of sulphate of iron em-ployed in each charge, is always effloresced in the lateral chambers,by a preceding heat. Thus each furnace is heated three times perweek, leaving the workmen at liberty the seventh day. The depot of this acid is at Frankfort, on the Mayne; in Paris itsfirst cost is forty sols the pound. The sulphate of iron costs 1 thalerand 12 bons groschens the quintal. The
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