The new chain, designed by engineer Captain Thomas Machin, could have theoretically been lowered in order to let friendly ships sail down the river, but the chain was never tested, and was later discarded after the war.
The new chain could have theoretically been lowered in order. This was to let friendly ships sail down the river. The new chain is designed by engineer Captain Thomas Machin. The chain was never tested. The chain was later discarded after the war.