US Internal Revenue hydrometer Small 44×320 Medium 88×640 Large 141×1024 Download Tiff Original 330×2400 | (129.1 KB) Description "The US Treasury Dept. and its internal revenue servie uses a series of carefully adjusted hydrometers for determing the amount of alcohol in various distilled liquors."—Finley, 1917 Keywords alcohol, chemistry, density, hydrometer, Internal, irs, revenue, service Galleries Chemistry Apparatus Source: Finley, John H. Nelson's Perpetual Loose-Leaf Encyclopedia (New York City: Thomas Nelson and Sons, 1917) 11:358
