Incubating eggs

We have just put on to incubate, 20 eggs from our chickens. It took 6 days to collect them. They are mostly brown marans eggs but there are 6 white gasconne ones too. Hopefully the cockeral has done his job and they are fertilised. The hens all have feathers pulled off their backs, so I assume he has been 'at it'. We will see in around 21 days.

As advised by various sources on the internet, we kept the eggs pointed end in a cool room (about 12-14C) and we slightly tilted the tray with a book under it and changed which side was up a couple of times a day.