I have before me a book entitled"HOME HONEY PRODUCTION by W.H. Bielby that describes a catenary hive. It is a top bar hive thathas the ends and the sides curved in the shape that a hanging chain would make. The idea is that the bees will not attach comb to ends and bbottom of that shape. I built a couple of those hive a dozen years ago with the intention of putting a swarm in them but other things happened and I didn't get the swarms. I was out of the business at the time. Has anyone experience with catenary hives? The author was a Britisher but the book was republished in the USA in 1977. I don't temember seeing any top bar hives in Ethiopia but a couple of beekeepers tried homemade hives with sloppy bee spaces. The trick theree was keeping bees from abscounding.