Antique Gunpowder Tester,Before gunpowder makers had an easy method to make powder of uniform qualit
Antique Gunpowder Tester,Before gunpowder makers had an easy method to make powder of uniform quality, they would often need to use special testing devices. Usually such devices were created from regular flintlock and percussion lock pistols. The device above would have been loaded with a charge of powder and fired, which pushed the gauge forward. The farther the gauge went, the more potent the gunpowder. -- source link
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