I only was able to access the abstract of Baker's study. It was cited by Tibor Szabo, in his report from Beaverlodge, Alberta. He used a "2.5 cm [1 inch] diameter auger-hole in the middle of the second chamber."
Regarding the climate: "December is brutally cold in Iowa with the average high temperatures in the 28°F (-2.2°C) to 37°F (2.8°C) range and the average low temperatures in the freezing 9°F (-12.8°C) to 21°F (-6.1°C) range. "
PLB
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