Why does it have to make noise?
If it moves, it's alive. Nothing to worry about. And if there were something to worry about, it's too late to do anything about it.
The time to worry is early on keeping the temperature and humidity correct. Also keeping the incubator closed and keeping your hands out of it. After that just let nature take it's course.
Set it and forget it. No wonder you don't have time to have a job.
That's helpful. I try to keep it as simple as possible. They are Continuing Education classes so too much detail isn't warranted.
On the subject of light, I might add a few things. [COLOR=333333]In addition to the day vs. night thing stimulating production, c[/COLOR][COLOR=333333]hickens don't have to see the light. Blind chickens can also detect a change in day length. Light penetrating the skull is still detected by the pineal gland.[/COLOR]
Leave it alone. A wafer is either on or off. Sending power to the heat element or not. The temp will rise till the wafer opens. Then it will cool a bit before it closes again. For that reason, it's impossible for it to remain a steady temperature.
The internal egg temperature will be more steady.
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IMO, you mess with the incubator too much.
The weather has been nothing short of amazing the last month. I pray we don't get an April freeze. The blossoms have fallen off most of the fruit trees already.