Trithal engine-house on with the Roman Catholic chapel at Penzance N. by W. leads one mile westward of this shoal.
nearly one mile.  Trithal engine-house on with the Roman Catholic chapel at Penzance N. by W. leads one mile westward of this shoal.  Between the Iron Gates and the Mountamopus there is a good channel three quarters of a mile broad carrying a depth of from 6 to 10 fathoms.