First off, you may note that I changed the title of this project to reflect an updated date. The original photo was said to be taken after 1916. So, I changed the title from saying “c.1910” to “c.1916”, though the boat could be from a little bit later. I got a little wrapped up recently in the layout of the little deck house, which clearly shows a ventilator cowl, but also seems to show a little exhaust pipe peek out from behind it. It’s a bit hard to see in the photo, so I’m posting a close-up of the photo below.

Close up of the original image shows the ventilator cowling on the left and what looks like an exhaust pipe on the right.
Now, there’s a possibility that this is just a piece of paper in the hand of the man standing on deck. Bill of sale, maybe? But, it’s awfully straight and seems to be perfectly perpendicular to the deck house roof. Plus, at the beach like that, it’s hard to imagine a paper not curling in the breeze. So, I’m tending to believe it’s a pipe. Either an exhaust pipe or a stove pipe.