Analyfis of the Mr. 179 



Tartar , made with nitre and tartar, and 

 mixed with a double quantity of calx of 

 bones, yielded in diftillation 112 cubick 

 inches of ait; that is, 224 times its bulk of 

 air, which 1 12 cubick inches weighing 32 

 grains, is nearly f part of the weight of 

 the Sal Tartar. There is a more intenfe de- 

 gree of heat required to raife the air from 

 Sal Tartar than from nitre. 



Hence we fee, that the proportion of 

 air in equal bulks oi Sal Tartar and nitre is 

 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 it than this had, becaufe it is found 

 to make a greater explofion in the Tttlvis 

 Fulminant, than the nitrated Sal Tartar. But 

 fuppofing, as is found by this Experiment, 

 that Sal Tartar, according to its fpecrfick gra- 

 vity, contains j part more in it than nitre 5 

 yet this excefs of air is not fufficicnt to 

 account for the vaftly greater explofion of 

 Sal Tartar than of nitre 5 which feems prin- 

 cipally to arife from the more fixt nature 

 of Sal Tartars which therefore requires a 

 more intenfe degree of fire, to feparatethe 

 N z air 



