Before revision: 2, also known as Old Brass Brains, was a special-purpose mechanical analog computer that uses gears, pulleys, chains, and other mechanical components to compute the height and time of high and low tides for specific locations.
After revision: 2, also known as Old Brass Brains, was a special-purpose mechanical computer that uses gears, pulleys, chains, and other mechanical components to compute the height and time of high and low tides for specific locations.