That's really long for what appears to be a non-rigid airship. The Navy class-N ships were about 400 feet long, and I had thought they were the largest non-rigids; this was thirty feet longer and forty years earlier.
1908 Popular Mechanics had 3 successive articles about it.<p><a href="https://todayinsci.com/Events/Aircraft/MorrellAirship-Collapse.htm" rel="nofollow">https://todayinsci.com/Events/Aircraft/MorrellAirship-Collap...</a><p>The 2nd interviews Captain Penfold, an Australian balloon pilot that had sunk on-board.