Positioning and turning: Egg is positioning in the
incubator and turning ensured that the embryo was
fully developed and in position to hatch. Common
practice in the chicken was to set the eggs vertically
with the air cell at the top of the egg. Any eggs that
were positioned on their sides should be turned on
their long axis. This means the eggs were set at a 45°
angle, after a 90° turn; they face 45° in the other
direction