Amlyfis of the Air. 



I 



179 



Tartar, made with nitre and tartar, and 

 mixed with a double quantity of calx ot 

 bones, yielded in diftillation 112 cubicle 

 inches of air; that is, 224 times ics bulk of 

 air, which 112 cubick inches weighing 32 

 grains, is nearly j part of the weight of 

 the Sal Tartar. There is a more intenfe de- 

 gree of heat required to raiie the air from 

 Sal Tartar than from nitre. 



Hence we fee, that the proportion of 

 air in equal bulks of Sat 'Tar tar and nitre is 

 as 224 to 1 80. 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 mor 

 air in it than this had, becaufe it is found 

 to make a greater explofion in the Ttdvis 

 Fulminant, than the nitrated Sal Tartar. But 

 liippofing, as is found by this Experiment, 

 that Sal Tartar, according to its fperifick gra- 

 vity, contains \ part more in it than nitre ; 

 yet this excels of air is not fufficicnt to 

 account for the vaftly greater explofion of 

 SalTartar than of nitre 5 which fecms prin- 

 cipally to arile from the more fixt nature 

 ot Sal Tartar ; which therefore requires a 

 more inrenfe degree of fire, to feparatethe 









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