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WATER AND THE O C E A N 



59 



veral of tliefe fubflances form a bitter fait by their mixture, they ocean.. 

 neverthelefs will not hinder the fea- water from alfdrding a clear, 

 limpid, potahle water by diflillation, becaufe the particles being all 

 fixed, remain in the falt-brine, which is left in the copper ; and \ 



the water being alone volatile, rifes m fleams, and is diftilled. 



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Or even if, by diflillation, a few acid or faline particles iliould be 



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volatilized, and mix with the diililled water, their proportion is 

 certainly fo fmall and infignificant, that no detriment can be derived 

 from thence. On the ufefulnefs and pradicability of the method 

 of diftilling water, I can fay nothing, as it is not my province, 



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and as a report has been made to the Admiralty by perfons, whofe 

 proper bulinefs it was. 



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'The Wakmth, or Temperature of tjie Ocean^* 



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To afcertain the degree oi warmth of the fea- water, at a certain, 

 -depth, feveral exjperinients were made by us. 



The thermometer 



made ufe of, is of Fahrenheit's conflrudion, -made by Ml\ Ramf 

 den, and furniilied with an ivory fcale : it was 

 always put into a cylindrical tin 



cafi 



cafe, wdiich had at each end 



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- valve^ admitting the water as lon^ as the inftruraent was goi 



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