Purchasing eight acres, he handed off the job of constructing it to a trusted councillor Sir Reginald Bray with the final construction, according to a 17th-century tome. It measured 330 feet on each side, the bottom of the dock 395 feet long, and the whole 22 feet deep. The wharf on the outside of the piers that marked the dock's location were 40 feet on each side at a depth of 22 feet. Henry VII and the dock operated by swinging some hinged gates open, allowing the ship to enter, and then water was taken out with a bucket and chain pump worked by a horse-gin.