That's an interesting site- a bit bland-looking tho.
They say about the mills, tho:
Did You Know?
The factory bells dominated daily life in Lowell. They woke the workers at 4:30 a.m., called them into the mill at 4:50, rang them out for breakfast and back in, out and in for dinner, out again at 7 p.m. at the day's close. The whole city, it seemed, moved together and did the mills' bidding.