> The hives were set up on concrete blocks about eight inches above a concrete pad which extended about twelve feet out from the side of the barn.

Height above the ground seems to help a lot.  Could be one reason triples do better than doubles and doubles do better than singles for me.

> The one thing I did which probably was not common at the time was to run the hives with 1" spacer blocks between the inner and outer covers. This allowed free movement of air from the entrance up through the hive and out from the space between inner and outer covers

I am having trouble visualising this. Could you describe this in a bit more detail?  How many blocks, how big, placed exactly where?

Thanks.

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