extra&mg Marine Salt from Sea Water, 1 1 j 



' ■ r r- ... 



funk to the level of the tide water, from which is carried a 

 iubterraneous pipe, towards low water mark. A fmall wind- 

 mill, wath canvafs fails, being now connecfled with the pump, 

 the water is tlii'own into fpouts, and conveyed to every part 

 of the works, as occafion may require. Having now com- 

 pleted the machinery, and brought the proprietor to that ftage 

 of the builnefs in which he may anticipate his Vompenfation ; 

 ,it is next incumbent upon me to defcribe particularly the pro- 

 cefs, by which the different kinds of fait are ufually obtained. 

 In doing this, I fhall have regard to the order in which the 

 occurrences will fuccefllvely refult. 



I L 



The water being pximped into tke vrater room, im.mediately 

 , after being finilhed, that the work may {well anti become 



tight, fhould continue there until a confiderable part of it has 

 evaporated, and the refidue acquired the flrength and iliarp- 

 nefs of brine. The plugs are then to be withdrawn from the 

 partition, and the liquor let into the pickle room. The length 

 of time required for its continuance in the firfl room, muft 

 evidently depend upon the degree of heat to which it has been 



pofed ; but for the precife time of drawing the liquor out 



of the pickle room, we have a more corre^ criterion ,• for 

 this flage of the procefs, a calcareous earth or hme begins to 

 appear upon the furface, and foon fubfides to the bottom in the 

 form of a white earthy powder. Soon after this occurrence, 

 the liquor being almoft fully faturated with fait, exhibits a 

 faline pellicle upon its furface ; and in a dry day fmall cryflab 



begin to form, which immediately concrete into corns, refem.- 



bling 



t 



