200 



VINEGAR, CIDER, AND FRUIT-WINES. 



cork a glass tube, 7^, which is about f inch in diameter and 7} 

 inches in length. On top this tube is closed by a perforated 

 cork. From the latter a glass tube bent twice at a right angle 

 leads to a cooling coil, which is placed in a vessel, F, filled with 

 water, and ends over a graduated cylindrical glass vessel, G. 



Distilliug Apparatus for the Determination of Alcohol. 



The uppermost mark on G indicates the height to which the 

 vessel must be filled to contain J liter = 500 cubic centimeters. 

 Generally vessels are used which are so graduated that the dis- 

 tance between two marks is equal to -$ liter or 50 cubic centi- 

 meters. The boiling flask stands upon a plate of thin sheet-iron 

 (to prevent bursting from an immediate contact with the flame), 

 and together with the cooling vessel is screwed to a suitable sup- 

 port. 



In distilling a fluid containing acetic acid the vapors of the 

 latter pass over together with those of alcohol and water, and, 

 consequently, the statement of the alcoholometer would be in- 

 correct. This evil is overcome by placing a few pieces of chalk 

 the size of a hazel nut in the tube R. By the vapors coming in 

 contact with the chalk the acetic acid is fixed to the lime con- 

 tained in it, not a trace reaching the cooling vessel. 



The manner of executing the test with this apparatus is as fol- 



