I have a double screen frame, (screen on two top and bottom of a frame about 1/2 in thick. I place it in between the two hives ( one brood chamber each) with both having an entrance but reversered from each other.
The bees can not get thru it but the scent will, after about a week I remove it and turn the entrance faceing the same way. If I can get a good picture I will post it here tomorrow.
They are also called Snelgrove boards, I just made one this week. Here is a link that describes how they are used. Basically, the hive odors are circulated through the boxes, while the "doors" are manipulated to allow a gradual mingling of the bees. After a week or so, the board is removed. They can also be used to raise some queen cells, but the original use was to prevent swarming.
Can this also be used when you want to make comb honey? I've heard about a theory of using two queens I think. I think you split a hive with a double queen excluder which gives you more brood which equals more worker bees for making more honey.
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