WATER TOTAL OR COMBINED. 
43 
ind the salt solidifies and makes an air-tight joint, the test of which is 
ihe permanence of the column of sulphuric acid in the bulb tubes 
jaused by the contraction of the air in the platinum apparatus as it 
jools. 
After drying by a current of air at 105° C. for two hours, more or 
''ig. 8. — Details of the Gooch crucible for determining' water. S, seat of stout platinum wire resting 
on ring R', and serving as a support for the crucible; II'", blast-fed ring burner; R", support for air 
or toluene bath O. 
ess (see below, p. 45), b/y means of an air or toluene bath as shown in 
igure 8, the absorption tube A (fig. <)) is interposed between the sul- 
)huric-acid bulbs and the apparatus, being fitted to the latter by its 
stopper, which is at other times closed by a glass plug,and while a slow 
