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I'm sure you've seen them - entrance feeders which have a perforated plate underneath a jar - relying on the meniscus formed underneath that plate or mesh to prevent dripping. But that's not the Boardman principle - his design was a true 'gravity feeder', the same as used for caged-bird drinkers.
I stumbled across some 'Gleanings' posts by Boardman last night, and here's the diagram he supplied:
As you can see, the key component is marked as 'B', and is a shallow dish or saucer with a raised rim which is clipped onto the jar, leaving a small gap for the syrup to run out into the dish. With such a small gap and a raised rim, the prospect of leakage is significantly reduced.
The 'anti-robbing' tangs (marked 'D') could always be further extended into the hive so that access to the feeder occurs several inches away from the entrance.
Not my choice of feeder, but hope the above proves of some passing interest ...
LJ
I stumbled across some 'Gleanings' posts by Boardman last night, and here's the diagram he supplied:

As you can see, the key component is marked as 'B', and is a shallow dish or saucer with a raised rim which is clipped onto the jar, leaving a small gap for the syrup to run out into the dish. With such a small gap and a raised rim, the prospect of leakage is significantly reduced.
The 'anti-robbing' tangs (marked 'D') could always be further extended into the hive so that access to the feeder occurs several inches away from the entrance.
Not my choice of feeder, but hope the above proves of some passing interest ...
LJ