HYDROMETER TABLES. 



389 



Table corresponding u-ith Trollies Hydrometer for Spirits, 

 by Volumes, from to 100. Opposite cadi Volume of 

 Pure Alcohol is affixed its Specific Gravity, and its Com- 

 mercial Strength, over and under Proof. 



Pure alcohol has a specific gravity of .7940, at 60 heat, and is 100 

 per cent, over-proof. 



75 volumes of pure alcohol, and 25 volumes of water, have a speci- 

 fic gravity of .8765, or 50 per cent, over-proof. 



50 volumes of pure alcohol, and 50 volumes of water, have a speci- 

 fic gravity of .9335, or proof spirits. 



25 volumes of pure alcohol in 75 volumes of water, have a specific 

 gravity of .9700, or 50 per cent, under proof. 



Pure water has a gravity of 1.0000. 



At 60 degrees of the thermometer, the ahove tables are perfectly 

 correct ; but when the temperature is below 60, an addition must be 

 made of one volume for every five degrees of the thermometer ; and 

 when above 60 3 , a like quantity must be deducted, or 2 per cent, 

 on the commercial strength for every 5 degrees of heat adding when 

 below, and deducting when above 60. 



* For the preparation of these tables, the author is indebted to Mr. Robert Ben- 

 nett, of Cincinnati, Ohio 



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