2015-05-25. Amazingly, after only a couple of weeks Hive 2 had expanded to nearly fill the one brood chamber and had also made a lot of extra comb in odd places (”spur comb”). They had begun to make queen cells (sorry, no pix!), a precursor to swarming.
So I quickly got Hive 3 set up for a “split” - a colony composed of brood and nurse bees that will create their own brand new queen. I took three frames full of brood at various stages, including a few queen cells, rapped all the bees off back into the hive, and put them in the new brood chamber for Hive 3. I knocked off the bees because I only wanted “nurse” bees, who are apparently committed to brood, not to the queen. I also did not want to accidentally move the queen or any of the foraging bees (those would be ”field bees”) in the new hive split. Then I put a “queen excluder” over the original Hive 2 brood box to keep the queen in, and set the new brood box on top, with the hope that nurse bees would move up through the screen to the brood in the split.
After a few hours the split was full of bees, hopefully mostly nurse bees. I took it off Hive 2 and put it on its own base, creating Hive 3!