The present state of the manufacture of salt explained : and a new mode suggested of refining British salt ... to which is subjoined, a plan for abolishing the present duties ... on the manufacture of salt ... / [Archibald Cochrane Dundonald].
- Archibald Cochrane, 9th Earl of Dundonald
- Date:
- 1785
Licence: Public Domain Mark
Credit: The present state of the manufacture of salt explained : and a new mode suggested of refining British salt ... to which is subjoined, a plan for abolishing the present duties ... on the manufacture of salt ... / [Archibald Cochrane Dundonald]. Source: Wellcome Collection.
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![[ *7 ] * The fuperior quality of fait, thus freed from * the bitter naufeous falts, is no lefs obvious « to the tafte than its effe&s are in falting or * preferving of fifli, meat, and butter; of * which I have fatisfied myfelf by a variety ‘ of experiments. I am, ‘ SIR, &c. < P. S. If a fait perfectly pure is required, 6 as all fait made by fire contains a finall por- * tion of uncombined magnefia, the fait may « be freed from it, by adding to the firfi: liquor 4 that the fait is wafhed with, as much ma- 4 rine acid as will neutralife and diffolve the ‘ magnefia/ The feparation of the magnefia falita, depends again upon its iftrong attraction for water; for if the fait, fubmitted to purifica- tion, be previoufly well dried, the exficcated magnefia falita con- tained in it, will deprive the falt-brine, or the folution ufed for purifying the fait, of the water neceffary to keep the fea-faltcon- tained in it in folution, will force the fea-falt tocrydallize in its paflage, and the magnefia falita, thus diffolved, will drip or run off along with the magnefia vitriolata. In purifying of fait at the fait works, there is no occafion for a fcrupulous adherence to the .directions given of doing it in a veffel of a conical figure, or of pouring the hot brine upon the top of the fait; for as the procefs is neither more nor lefs than the wafhing«of fait in a hot and pure brine, it may either be done by pouring the brine upon the fair, or by putting the fait into the hot brine, which kit method the Author puts in practice athis fait-works in the firlt purification ; but the lalt part of the procefs, in order to fave a fuperfluous dif— folving of fait, he recommends to be done in conical veffels of a fize to contain or more bufhels of fait at a time,](https://iiif.wellcomecollection.org/image/b28769478_0023.jp2/full/800%2C/0/default.jpg)
