AND WINE MAKING. 



201 



used, and can be had in any optical establishment. They 

 are made of glass, platina, or silver, at prices ranging 

 from $3 to 110. 



Figure 29 shows must scale (silyer) and test tube. With 

 the scale you should also have a long glass, or tin tube 

 made for the purpose of holding the must while testing it. 



An Acidimeter. — The one inyented and patented by 

 Henry Twitchell is simple, and can be used with accuracy 



Fig. 30. — ACIDIMETER. 



by beginners. It is a timely invention, as it took long 

 practice to work correctly with either Otto's or Geissler's. 

 It is accompanied with full directions for its use. Fig- 

 ure SO gives an illustration of the Acidimeter. 



