Analyjis of the Air. 185 



as 224 to 180. But weight for weight, nitre 

 contains a little more air in it, than this Sal 

 Tartar made with nitre. But Sal Tartar 

 made without nitre, has probably a little 

 more air in • than this had, becaufe it is 

 found to make a greater explofion in the 

 Pulvis Fulminant than the nhra'ed Sal 

 Tartar. But fuppofing, as is found by this 

 Experiment, that Sal Tartar^ according to 

 its fpecifick gravity, contains 7 part more 

 in it than nitre ; yet this excefs of air is not 

 fufficient to account for the vaftly greater 

 explofion of Sal Tartar than of nitre ; which 

 feems principally to arife from the more 

 fix'd nature of Sal Tartar \ which therefore 

 requires a more intenfe degree of fire, to 

 feparate the air from the ftrongly adhering 

 particles, than is found requifite to raife the 

 air from nitre. Whence the air of Sal Tar- 

 tar muft neceflarily thereby acquire a greater 

 elaftick force, and make a more violent ex- 

 plofion, than that of nitre. And from the 

 fame reafon it is, that Aurum Fulminam 

 gives a louder explofion than Pulvis Ful- 

 minam. The fcoria of this operation did 

 not run per detiquiutn, 2l proof that all the 

 Sal Tartar was diftillcd over. See Vol II. 

 p. 2S2. 



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