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spring balance N

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The boiler is surmounted with a handsome brass dome on which are two spring balances for the safety valves, while a neat copper ring is an adornment to the chimney. en.wikipedia.org

A friction band is wrapped around half the drum's circumference and each end attached to a separate spring balance. en.wikipedia.org

A substantial pre-load is then applied to the ends of the band, so that each spring balance has an initial and identical reading. en.wikipedia.org

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