HYDRAULICS AND HYDROSTATICS. 



The centesimal hydrometer, by 

 Guy Lussac, is an exception, the 

 extreme points being water and 

 absolute alcohol ; this space is 

 divided into one hundred parts, 

 thus showing in alcoholic mix- 

 tures the percentage of alcohol 

 in the liquid. They are made of 

 glass, brass, and silver, usually 

 from six to ten inches long, of 

 the form represented in the cut 

 (Fig. 239), the graduations being 

 marked on the stem. 

 Price, Baume's and Car- 

 tier's, for spirits, 

 in glass, 

 " " " " in brass, 



Fig. 238. 



$0.50. 

 $3.50. 



in silver, $5.50. 



"acids, 



$6.00. 



in brass, $4.00. 

 in glass, $0.75. 



Twaddell's, 

 Guy Lussac, 



$1.00. 



in brass, $6.00. 

 in silver, $9.00. 



Table showing the Comparative Scales of Guy Lussac and 

 Baume, with the Specific Gravities and Proof, at t/ie 

 Temperature of 60 Degrees. 



