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Hi Al, Here's an article by Sally Sunshine that is really helpful to read: http://www.backyardchickens.com/a/hatching-eggs-101
If you have time, read the whole thing. If not, scroll down to the humidity section ans you'll see that humidity is not a set number. You need to adjust your humidity to get the proper weight loss for the egg as measured by the air cell size.
What kind of incubator do you have?
If your average humidity is too low, the eggs will lose too much water and the chicks will become stuck in the shell and won't be able to hatch. If the humidity is too high, they won't lose enough water and will drown when they pip.
Draw a circle around your air cell to measure progress on day 7, 14 & 18 so you can track progress and make adjustments.
Edited by FridayYet - 1/4/16 at 8:16pm