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APPENDIX"; 



" 2. In confequence of the principles of dillillatlon 

 " being fully afccrtained, the contrivance of the {impleft 

 '' means of obtaining the greateft quantity of diftilled 

 " water, by making the tube fufficiently large, to receive 

 " the whole column of vapour; and placing it nearly in a 

 *' horozontal direction to prevent any compreflion of the 

 " fluid, which takes place fo much with the common 

 ** worm. 



" 3. The adopting the flmpleft and moft efficacious 



" means of condeniing vapour ; for nothing more is re- 



** quired in the dilHllation but keeping the furface of the 



" tube always wet ; which is done by having fome fea- 



water at hand, and a perfon to dip a mop or fwab into 



this water, and pafs it along the upper furface of the 



" tube. By this operation the vapour contained in the 



" tube will be entirely condcnfed with the greateft rapi- 



*' dity imaginable ; for by the application of the wet mop 



*' thin fheets of water are uniformly fpread, and mechani- 



" cally prefled upon the furface of the hot tube ; which 



" being converted into vapour, make way for a fucceflion 



" of frefh fheets; and thus both by the evaporation and 



" clofe contact of the cold water conftantly repeated, the 

 heat is carried off more effedlually than by any other 



method yet known. 



" 4. The carrying on the diAillation without any addi- 

 *' tion, a corre<ft- chemical analyfis of fea water having 

 *' evinced the futility of mixing ingredients with it, either 

 *' to prevent an acid from riling with the vapour, or to 



*' deftroy 



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