MECHANICS OF LIQUIDS 83 



82. Beaume Hydrometer. The Beaume hydrometer is 

 used to determine the strengths of liquids in bleacheries, etc. 

 The readings are expressed in degrees which may be changed 

 into specific gravities by this formula: 



146.3 



Sp. gr. = 



146.3 -N 

 N is the reading on Beaume scale. 



EXAMPLE. Change 30 Beaume to specific gravity. 



146.3 146.3 



Sp. gr. = - = - - = 1.258 

 146.3 - 30 116.3 



83. Twaddell Hydrometer. The Twaddell hydrometer is 

 used by many manufacturers. The readings may be con- 

 verted into specific gravity from this formula 



100 + .5N 



N is the Twnddell reading, 



EXAMPLE. Change 84 into specific gravity reading. 



100 + 42 142 



Sp. gr. = - = - =. 1.42 

 100 100 



Questions 



1. Is water necessary for industry? Explain. 



2. What great property do liquids possess that solids do not? 

 What use is made of water in industry? 



3. A liquid is often used as 9 part oi machinery. What 

 property is utilized? 



