STATE GEOLOGIST. 17 ( .) 



brine is by weighing ■ giv< d bulk of i1 with ■ deli- 

 cate balance. The most convenient method, however, is l>y 



means of a I ■ >\ ami this is sufficiently accurate for 



practical pui • t ia an instrument 



orally ma of i fcobe closed at both 



ends with a large Dulb blowD in it, and a weight attached at 

 the lower end. The tube is graduated above the i>ull>, in such 

 .nor that when the instrument is placed in pure water it 

 sink> [<> a mark designated 0, and when placed in a liquid 



an water, it sinks to some mark below the fust, 



against which is the figure which designates the true specific 

 gravity of the fluid. In Beaum&a hydrometer, which is the one 

 d era! purposes, the figurei en thi 1 i not 



nate the i gravity directly. The scale is gradi 



from <» to soms arbitrary point which reads 30° or 40° — tho 



anally, or nearly equally, divided, so 

 Be gravity can only be known from it by a 

 calculat; 



The hydrometer, however, which is most convenient fol ex- 

 periments with brine, is the one which marks U when imn • 1 

 in pui .. and 100° when immersed in saturated brine. 



This instrument is called a sahmeter. The number of de 



ited upon the salometer, therefore, is the per centageol 



■afeOf • I ine. We may speak i 



turation. 

 It must he distinctly understood, that 25 per cent, of satura- 

 mean that 25 per cent, of the brine is com] 



of salt Twei per cent, of salt produces 100 per Cent 



of saturation — and this happen nine's hydrom- 



It is apparent, therefore, that the . y o( a brine, 



the readill fa of the hydrometer and T, and the per < 



true thing, 

 which maj i ,\ by the nuno brine 



i .' salt of 56 II H is often desirable 



ch other, I ha dated 



