Lesson plan
Cran (unit)
A cran, in use from at least as early as the 18th century, was a unit of measure of landed uncleaned herring used in the North Sea fishing industry. In 1852 it was defined to be the equivalent of one standard box of about 37.5 imperial gallons - typically around 1200 fish, but varying anywhere between 700 and 2500. In metric units it is about 170.5 litres. The word is from Scottish Gaelic , meaning "lot, measure of herring, tree".
Article summary
A cran, in use from at least as early as the 18th century, was a unit of measure of landed uncleaned herring used in the North Sea fishing industry. In 1852 it was defined to be the equivalent of one standard box of about 37.5 imperial gallons - typically around 1200 fish, but varying anywhere between 700 and 2500. In metric units it is about 170.5 litres. The word is from Scottish Gaelic , meaning "lot, measure of herring, tree".
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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