Check out these photo to canvas images:
Ca. 1914: submarine AE1 from above, with a canvas structure behind the conning tower - RAN SeapowerCentre.
Image by Kookaburra2011
6243. Seen, we think, from the upper deck of a cruiser, this photo is reproduced with the purpose of furthering the discussion going on under Entry 6240 concerning the mystery submarine[s] or objects in that photo three entries back. One suggestion has been that the utterly unknown structure[s] are a WWI ruse intended to deceive - which would be, of course, and intention to deceive any unfriendly eye observing the ships and boats at Garden Island.
On that point, we observe the canvas structure aft of the conning tower here, and what looks like a wooden beam projecting from the centre of it. Could the purpose have been to create the impression that the RAN's two E class boats carried a deck gun [which they didn't] ?
Also, what is the framed structure seen on the water beside the submarine on the other side , and does that have a connection with the boat-like structure shown in the foreground of Pic 6240? Our imaginations are heightened.
Photo: RAN SeapowerCentre, online.