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The invention of clocks coincided with the elaborating of subdivisions of time for work, of which the hour became the most common, underlying the concept of an hourly wage. [ 2 ] [ 3 ] Wages were paid in the Middle Kingdom of ancient Egypt, [ 4 ] ancient Greece , [ 5 ] and ancient Rome. [ 5 ]
The Brooklyn side's caisson, which was built first, originally had a height of 9.5 feet (2.9 m) and a ceiling composed of five layers of timber, each layer 1 foot (0.30 m) tall. Ten more layers of timber were later added atop the ceiling, and the entire caisson was wrapped in tin and wood for further protection against flooding.