Close-ups of Alternate Model 2 are here. Close-ups of Alternate Model 1 are here. And my original model, the one I follow in my own construction is here.
This post is about Alternate Model 3, which comes in two versions, I'll call Version A and Version B.
This screen looks deceptively simple, but seems to be in fact one of the more complicated constructions The frame is put together with a form of butt joint. The screening is held in with a bit of trim inset into a rabbet in the frame, just like my original model. The joints are held together on the outside with nails and angle irons.
However, the corners of the frame go together in a kind of pinwheel fashion. If you zoom in on the front, you will see that the top and bottom stiles are not symmetrical, but rather, well, I don't have a word for it, the four corners rotate in what I'd call it a pinwheel fashion. And I've got no idea what is going on the inside of these joints. Let me try to demonstrate with photos.
So, here is the front. If you look closely, you can see that the piece of wood that makes up the top stile is not symmetrical. On the left, it stops short and is framed by the left stile coming all the way up to the top edge. On the right, it goes all the way out to the right edge. Whether or not there is a dowel rod in there, don't know. And, how the rabbet works is not clear, because the inside back of the joint is covered by the angle fastener. So, the inner workings of these joints is a mystery to me.
And finally, if someone has photos of a different kind of window screen construction, I'd be very open to a guest blog post on it.