Re yesterday's posting by Wideford, Braeside is indeed a stalled cairn but with a tripartite stalled chamber and is described as such by Davidson and Henshall in "The Chambered Cairns of Orkney".

Huntersquoy had an upper tripartite chamber of which only two stones remain visible and a lower chamber which is intact and where the passage entrance is visible - see
http://www.themodernantiquarian.com/post/21917

I'm happy the images have been ascribed correctly but the descriptions could be expanded to avoid confusion of these two nearby sites. I'd be happy to do that.