This style observation hive won the gold metal for equipment at the Apimondia meeting in Australia. It was designed by a German beekeeper called Bernard Mobus while he was the bee advisor to an agricultural college in Aberdeen, Scotland.
This Observation hive is actually a 5 frame nuc, which converts to an observation hive with the addition of the upper section. To do so, find the queen, put her into the upper section, and replace her frame with a division board feeder. (Feeder included, frames not.) The bottom is fully screened, the colony will not overheat as they process the syrup and care for the queen, and they can stay like this for days.