a farmer buddy built an incubator at the suggestion of his wife. He laid a couple of oven heating element within a bed of gravel (in a framed wooden box), along with the temp bulb, covered the bed over with some sand, then a layer of wood shavings. Claimed he hatched all his chicks that year.

 

I came late to this thread. It reminds me of the old saying, When all you have is a hammer, all your problems start looking like nails.