2i8 APPENDIX. 



" Taking advantage of the vapour which afcends in the 

 " kettle while the (hips provifions are boiling. 



" All thefe advantages are obtained by the abovemen- 

 *' tioned fimple addition to the common fliip's kettles. 

 " But Dodor Irving propofes to introduce two further 

 *• improvements. 



" The firft is a hearth, or ftove, fo conftruded, that the 

 " fire which is kept up the whole day for the common 

 *' bufinefs of the fhip, ferves likewife for diftillation ; 

 ** whereby a fufficient quantity of water for all the oecono- 

 " mical purpofes of the (hip may be obtained, with a very 

 " inconfiderable addition to the expence of fuel. 



" The other improvement is that of fubftituting, even 

 *' in the largeft fhips, caft-iroii boilers, of a new con- 

 *' ftru£tion, in the place of coppers." 



Directions for Distilling Sea-Water. 



" As foon as fea-water is put into the boiler, the tube 

 " is to be fitted either into the top or lid, round which, 

 ** if neceffary, a bit of wet linen may be applied, to 

 " make it fit clofe to the mouth of the veflel ; there will 



« be 



