Or let down their plummet, or sounding line; which was a line with a piece of lead at the end of it, which they let down into the water, and by that means found what depth it was, by which they could judge whether they were near land or not. The sounding line, with the ancients, was called by different names; sometimes bolis, and this is the name it has here, (bolisantev) , "they let down the bolis": and the bolis is, by some, described thus; it is a brazen or leaden vessel, with a chain, which mariners fill with grease, and let down into the sea, to try whether the places are rocky where a ship may stand, or sandy where the ship is in danger of being lost.