Ooops...... I see K Epp already answered.
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I do have heat lamps. I'll try that. If it hatches, when does it go back to Mom...when it's dry and able to walk?If the egg is jiggling and/or cheeping then it is trying to get ready to hatch, it may have been a bit cooler for a day so maybe it is late. I would wrap it loosely in a soft towel or cloth and put it in a shoe box under a brooder light. adjust the height of the light from the box to get a temp of around 100* (I can't remember what hatch temp is supposed to be in an incubator since I don't use them)
You can use the search block at the top of the page to look up hatch temp for incubator and probably even do a search for 'emergency incubator' to see how others have set it up. I have done the shoe box and lamp for a couple with success.
Once the chick is hatched, dry and upright I would graft it back to mama hen if you can.
I'd check for sound/movement in 24 hours.The 8th egg was cool by the time I got to it. The heat lamp kept fluctuating between 95 and 110 degrees. Got it to stabilize at 98, so I hope that'll work. Put egg under it in a plastic dog food bowl. How long do I give it before it's deemed dead, a day or so?
I've got another 1st time broody in my bantam pen and Storm (the Silkie/Cochin that started my group brood in January) has decided to join her. So my 1st timer (one of the "twins", a "silver partridge" cochin) got 7 bantam eggs and I gave Storm 4 orpington eggs that were on day 5 from my incubator. Storm is definitely proving the theory that silkies love to brood. Her last hatch was January 26th! Is there anything I need to look out for with her brooding again so soon? Or with her hatching LF? I'll try and get some pictures this afternoon.