The thinking that the egg will reach the same temperature as the air in the incubator is not correct. at least in regard to successfully hatching an egg.. Because it will eventually do so but not until the egg completely dries up. all the time a viable egg is roasting away it is loosing moisture. this moisture loss will carry away heat with it, actually a surprising amount of heat. this is why you get so cold when you climb out of a swimming pool. your egg in effect is in a constant just climbed out of the pool condition although a mild one. still it will have an significant cooling effect. Thinking of this made me wonder if your wiggler is wet or moist on the outside and cooling more rapidly than normal or something. truth is trying to hold a temp to 1/10th of a degree is not easy at best. trying to hold something to even a single degree is not all that easy. add to this that an egg does not necessarily take or release heat as readily as other objects do. metal for example will take heat readily, that is why it will both get hot quickly. it will also release heat quickly this is why it burns so badly. it will also let heat pass through it quickly. Styrofoam on the other hand will not you can have one side of Styrofoam be 100 degrees but not be able to feel any warmth on the other side even if it is only an inch thick. I am thinking the egg or at least the shell is more like Styrofoam than metal. This making it harder to get heat into it but the egg. the combination would very likely make it impossible for an eg that still contains moisture to ever match the temperature of the air around it. this would in part explain why an egg in 102 degree still air is only 99.5 degrees.
Now if you are measuring the temperature inside an egg. what temperature does it need to be? I know people say 99.5 but they also are assuming the inside of the egg is going to match the outside forced air incubator temperature. in fact forced air would tend to increase the loss of moisture from an egg and keep it even cooler, maybe.
My basic thinking surrounds the idea that an egg is not an in animate lifeless object that is unable to respond to it's environment. quite the opposite is true. it does have some ability to respond and compensate regardless of how subtle that response may be. this thinking would also explain the importance of humidity control with the effect has on the egg and how fast it looses moisture.
Now if you are measuring the temperature inside an egg. what temperature does it need to be? I know people say 99.5 but they also are assuming the inside of the egg is going to match the outside forced air incubator temperature. in fact forced air would tend to increase the loss of moisture from an egg and keep it even cooler, maybe.
My basic thinking surrounds the idea that an egg is not an in animate lifeless object that is unable to respond to it's environment. quite the opposite is true. it does have some ability to respond and compensate regardless of how subtle that response may be. this thinking would also explain the importance of humidity control with the effect has on the egg and how fast it looses moisture.