2IO 





APPENDIX. 

 " not attended with fuch inconveniences as rendered 

 " the feveral procefles of fcarce any utiHty. The defeds 

 of the various methods above enumerated, may be rc- 

 " duced to the following heads : 



I. The fmall quantity of water produced by the 

 ordinary methods of dinillation with a liill-head, and 

 worm, could never be adequate to the purpofes of 

 " fliipping, though the apparatus fliould be kept in con- 

 " ftant ufe ; and at the fame time, this mode of diftilla- 

 " tion required a quantity of fuel, which would occupy 



" greater fpacc than might be fufficient for the llowage 

 " of water. 



"2. k J} ill- burnt talle, which always accompanies this 

 " method of diftillation, and renders the water extremely 

 *' unpalatable, exxiting heat and thirft, if drank when 

 *' recently diflilled. 



3. A total ignorance with refpcfl to the proper time 



of Hopping the diftillation, whereby fait was permitted 

 " to form on the bottom of the boiler ; which burning, 

 " and corroding the copper, decompofcd the felenitic and 

 " magnefia falts, caufing their acids to afcend with the 

 *' vapour, and a6l on the ftill-head and worm pipe, im- 

 " pregnating the water with metallic falts of the moft per- 

 " nicious quality. 



" 4. The fpace occupied by the ftill, ftill-head, and 

 *^ worm-tub, renders the ufe of them in moft cafes totally 

 " impracticable on board {hips. Add to this, their wearing 

 '' out fo faft on account of the caufes above mentioned, 



*' the 





