I heard about a type of pistol that would allow the strength of alcohol to be measured. Gunpowder was mixed with the alcohol and it was fired in a flintlock. The explosion would move a needle around a protractor and the higher the alcohol content the further the needle would move, and give a higher 'degree' of proof. I think I even saw a picture of one once, but I cannot find any reference to an example of this type of instrument anywhere on the Internet. Did this really exist, or did I imagine it?
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