rotating band

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Ethel Rosenberg arrested in August 1950. Photograph dated Aug. 8, 1950. American civilians executed for espionage. Spies, communists, Julius Rosenberg

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Aurochs. Bos primigenius. Skeleton. Extinct animal. Skeleton of an Aurochs, an extinct wild ox.

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Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.

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Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

rotating band

military technology

Also known as: driving band

Learn about this topic in these articles:

use in ammunition

In artillery: Mortars
…Hotchkiss-Brandt type, a prerifled copper driving band, wrapped around the bomb, expanded under gas pressure and engaged the grooves in the barrel.
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