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Concept
Horizontal top-bar hive
Summary
A top-bar hive is a single-story frameless beehive in which the comb hangs from removable bars. The bars form a continuous roof over the comb, whereas the frames in most current hives allow space for bees to move up or down between boxes. Hives that have frames or that use honey chambers in summer but which use management principles similar to those of regular top-bar hives are sometimes also referred to as top-bar hives. Top-bar hives are rectangular in shape and are typically more than twice as wide as multi-story framed hives commonly found in English-speaking countries. Top-bar hives usually include one box only, and allow for beekeeping methods that interfere very little with the colony. While conventional advice often recommends inspecting each colony each week during the warmer months, heavy work when full supers have to be lifted, some beekeepers fully inspect top-bar hives only once a year, and only one comb needs to be lifted at a time.
There is no single opinion leader or national standard for horizontal hives, and many different designs are used. Some will accept the various standard frame sizes.
Although the two most well-known styles of long top-bar hives are named "Kenyan" and "Tanzanian", the Kenyan hive was actually developed in Canada, and the so-called Tanzanian hive is not the same as the top-bar hive that was developed in Tanzania.
The design of top-bar hives has its origins in the work done in 1965 by Tredwell and Paterson. A tub shaped top-bar hive was trialled in Rhodesia in the 1960s by Penelope Papadopoulou. Long top-bar hives began to appear in the 1960s and were first referred to as "grecian" hives also known as the "Anástomo" wicker skep. Similar "long" top-bar hives were also developed in the early 1970s by other authors. The David Hive (1972) was similar to the Kenyan top-bar hive, except that the comb was not cut from the bars at harvest time but reused after extraction. Also in 1972, William Bielby designed a top-bar hive that featured catenary curved comb.
Official source
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