This alcohol proof kit was used to test the amount of alcoholic
content found in liquor. Each ball had a number that corresponds with an
alcohol proof. Whichever ball sunk to the bottom of the glass would reveal the
proof of the alcohol. For example, if the ball with the number 22 sunk, it would
mean that the drink was a double whisky, whereas if number 34 sunk, it would mean
that the drink was weak and not properly made.
This was an excellent way for men to ensure the alcohol served to them was at its desired proof.
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