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Thanks, made it for this web page.
http://cmfarm.us/stillair.html
Understanding thermal layering is life an death knowledge for firemen. Houses layer just like that. Thats why we cut holes in roofs an crawl around.
In a forced air incubator both sizes should hatch about the same. In a still air incubator set at 101 at the top of a normal egg the inside of the egg will be 99.5 but if you do the same with a small egg the inside may be 100 because the bottom of the egg is not as far from the point of measure...