The elements of materia medica and therapeutics . dmitted,by a sluice, into a reservoir,where evaporation goes onwhile mechanical impuritiesare deposited. It then passesby a subteiTaneous communi-cation into a series of rectan-gular pans, and proceeds by avery circuitous route throughthem to another subterraneangutter, by which it is con-veyed into a long, narrow,circuitous canal. From thisit passes into a second, andsubsequently into a third se-ries of salt pans. During the whole of this time it is undergoingevaporation, and when it arrives at the third series of pans it is sofar concentrated
The elements of materia medica and therapeutics . dmitted,by a sluice, into a reservoir,where evaporation goes onwhile mechanical impuritiesare deposited. It then passesby a subteiTaneous communi-cation into a series of rectan-gular pans, and proceeds by avery circuitous route throughthem to another subterraneangutter, by which it is con-veyed into a long, narrow,circuitous canal. From thisit passes into a second, andsubsequently into a third se-ries of salt pans. During the whole of this time it is undergoingevaporation, and when it arrives at the third series of pans it is sofar concentrated that crystallization is soon effected. The salt isknown to be on the point of crystallizing when the liquid assumes areddish tint. It is then withdrawn from the pans, and collected uponthe borders, in conical or pyramidal heaps, vi^hen it drains and operations begin in March and finish in September. At Lymington^, in Hampshire, salt is prepared iiom the sea water,which is admitted into a reservoir or pond, and from this successively. Common Salt Pan. a. A flat shallow pan, varyiii- in width and length from 20 feet and upward, and 15 inches deep, made ofthick wrought iron. b. Fire-places, the flues of which go direct to the chimney. c. Hurdles on which the salt is drawn, to allow it to drain before it is conveyed to the store. d. Chimney at extremity of pan. e. Door of the supplying brine to the pan. /• For further information on the manufacture of common salt, consult Aikins Dictionary of Che-mistry, vol. ii. p. 118; Hollands Agricultural Survey of Cheshire; Dr. Henry, Phil. Trans. 1810;Mr. Furnivals Wharton and Marston Patent Salt Refineries, 1836; Dr. Brovvnriggs-!*•< of makingCommon Salt, 1748 ; and Dr. Jackson, Phil Trans. No. 53, p. 1060. For further details, see Phil. Trans. No. 51, p. 1025 ; and Dumas, Traitede Chimie, t. ii. Dr. Henry {Phil. Trans. 1810) has described the method of manufacture. In the summer of1840, I visited the Salt
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Keywords: ., bookcentury1800, bookdecade1840, booksu, booksubjectmateriamedica
