An incubator is a device simulating avian incubation by keeping eggs warm and in the correct humidity, and if needed to
turn them, to hatch them. Modern incubators are electrically heated with a thermostat. The temperature within an incubator
must be precisely maintained within certain limits for optimum growth of the egg. Also the egg has to be periodically tilted
every four hours to avoid the setting of the yolk.
There are two types of incubators:
1. Still Air Incubators
2. Circulating Air Incubators
In still air incubators the temperature has to be precisely maintained at 38.9°C. Circulating air incubators have fans for
air circulation, and in such incubators the temperature has to lie within the range from 37 to 38.5° C. For this purpose an
incandescent lamp is turned on to heat the air, and the heated air is circulated using a fan. Once the temperature exceeds the
maximum range the lamp is turned off and remains in that state till the temperature reaches the minimum.