Note 131 — Chapter V · TEMPLES AND MEMORIAL STONES.
Reading edition
The Menai tubes, composed of wrought-iron plates, measure each 1524 feet in length, and the weight of the whole is estimated at 10,540 tons. This enormous structure had to be raised a height of 100 feet, and thrown over an arm of the sea 1100 feet in width, and navigable by the largest ships.