The elements of materia medica and therapeutics . Middling Rock Best Rock. ria?. Scale ^?. p j Opening of LowerMiiie. Feet. in transparent co=lourless masses. Itis called in com-merce Prussiarock, and is largelyexported for pu-rification. Brinesprings are metwith both aboveand below the le-vel of the beds ofroclv salt. The brine ispumped up intocisterns or reser-voirs, from whichit is drawn whenwanted into largeoblong wrought-iron evaporatingpans, which areusually workedwith four or morefires. If the brinebe not completelysaturated withchloride of sodium,a little rock salt isadded to it. Bythe
The elements of materia medica and therapeutics . Middling Rock Best Rock. ria?. Scale ^?. p j Opening of LowerMiiie. Feet. in transparent co=lourless masses. Itis called in com-merce Prussiarock, and is largelyexported for pu-rification. Brinesprings are metwith both aboveand below the le-vel of the beds ofroclv salt. The brine ispumped up intocisterns or reser-voirs, from whichit is drawn whenwanted into largeoblong wrought-iron evaporatingpans, which areusually workedwith four or morefires. If the brinebe not completelysaturated withchloride of sodium,a little rock salt isadded to it. Bythe evaporation ofthe water the saltdeposits in crys-tals. The impuri-ties separate in theforai of a scum(which is removedby a skimming-dish), and of a se-diment called/?fi/^-scale, pan-scratchyox pan-bake. Thegrains or crystalsof salt vary in size,according to thedegree of heat em-ployed in theirpreparation. Thesmall-grained saltis formed by thestrongest heat, and Section of the Wharton Salt Mine, on the River Weaver, Cheshire. CHLORIDE OF SODIUM. 531 constitutes the butt
Size: 1349px × 1853px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, booksu, booksubjectmateriamedica
