The colony is a large colony on two brood chambers,which have been built up strong and even more frames of emerging brood added,so 21 frames of brood,then 2 supers. the queen has been restricted to the bottom box for nine days by Queen excluder,so no eggs or larvae in top brood box to raise cells on,one frame of open brood from bottom box added to top box in center,then graft frame,two supers now divide the two brood box's bottom queen exluder and and the top brood sits over a crown board with one hole in the middle and small cut out at the side to allow drones to fly. When most of the brood in the top box has emerged,it gets put down the bottom for the queen to carry on laying up. small quantity of syrup fed constantly.[/QUOTE
This is a great system very much the same as one i`ve used for years got 16 taken from the16 offered in the queen rearing hive at the moment but i am going to try the incubator for the first time with them