Modern incubators are electrically heated with a thermostat. Incubators can be used in a farmhouse, such as a large chicken raising facilities, or they can be found in a common classroom for students to observe the egg inside and when it hatches. Some industrial incubators are large enough to hold up to 124,416 eggs, and some other styles can only hold a few eggs.
The styles of incubators include the following:
- setter incubator
- hatcher incubator
- combination incubator
The incubator is an apparatus that is used for environmental conditions, such as temperature and humidity, that needs to be controlled. It is often used for growing bacterial cultures, hatching eggs artificially, or providing suitable conditions for a chemical or biological reaction. The incubator is recorded being used to hatch bird eggs and reptile eggs. It lets the fetus inside the egg grow without the mother needing to be present to provide the warmth. Chicken eggs are recorded to hatch after about 21 days, but other species of birds can take a longer or shorter amount of time. An incubator should be able to set the perfect environment and condition for an egg to incubate because it regulates the factors such as temperature, humidity, and turning the eggs when necessary. This is so that the egg is incubated properly because it plays the role of the hen in its natural state. The incubator also allows the egg to incubate while eliminating the external threats that could possibly harm the eggs. The modern hatchery manager’s goal is to produce large numbers of uniform robust day-old chicks. Robustness is a health criterion, originating in the embryonic life stage of the chicken – and correlating directly with the performance and resistance of individual chicks under differing farm conditions. It is possible to incubate different species of birds at the same time within the same incubator.It was also used to raise birds
In industrial incubation, there are two common used methods of incubation. In single-stage incubation, the incubator contains only eggs of the same embryonic age. The advantage of single-stage incubation is that climate conditions can be adjusted according to the needs of the growing embryo. In multi-stage incubation the setter contains eggs of different embryonic ages, usually 6 or 3 age groups.  Consequently, climate conditions cannot exactly be adjusted according to the needs of all the growing embryos and a compromise has to be sought to best suit the age groups presented in the setter. In a multi-stage incubation procedure, the heat produced by the older embryos is used to heat the warmth-demanding younger embryos in the same machine. Due to different physical demand in Multi-Stage and Single-stage different equipment is needed to be successful. Many industrial producers use traditional Single-Stage machines, but REAL Single-stage is available. 
- REAL Single-Stage
Common names of Incubator
The common names of the incubator in other terms include the following:
- breeding machines
- hatching machines
- egg incubator
- artificial incubation equipment
- egg breeding equipment
- egg hatching equipment
History of Incubator
The Egyptians had a method of incubating in 400 B.C., using a cylindrical building that had a fire at the bottom. The eggs that were incubating were placed on an inverted cone that was partially covered in ash. The eggs were placed in a woven basket that sat on top of the ashes. The building also had a roof that allowed smoke to escape, but it kept the rain out.
Controlled scientific incubation required the accurate and repeatable measurement of temperature, such as the alcohol-based thermometer proposed by the French naturalist and scientist René Antoine Ferchault de Réaumur in 1730, and the temperature scale named after him.
Réaumur used the thermometer in his design for an artificial incubator, presented to the Académie des sciences in 1747, and published in 1749 as l’Art de faire éclore et d'élever en toute saison des oiseaux domestiques de toutes espèces, soit par le moyen de la chaleur du fumier, soit par le moyen de celle du feu ordinaire (The art of hatching and rearing domestic birds of all species in all seasons, either by means of the heat of manure or by means of ordinary fire).
|Wikimedia Commons has media related to Incubators (poultry).|
- "SmartPro Incubation". PasReform. Retrieved 12 September 2014.
- "Incubator Terminology Explained". SureHatch. Retrieved 13 June 2018.
- "What is an Egg Incubator". WiseGEEK. Retrieved 7 September 2013.
- "Poultry: Reproduction & Incubation". MSU Cares. Retrieved 7 September 2013.
- LINCO Incubator Research & development
- Pas Reform Academy (2014). Incubation Guide Broiler v5, p:25
- LINCO Incubator Research & development
- Réaumur. Règles pour construire des thermomètres dont les degrés sont comparables et qui donnent une idée d'un chaud ou d'un froid qui puissent être rapportés à des mesures connues. Mémoire de l’Académie des Sciences de Paris, 1730
- Rude, Emelyn (2016). Tastes Like Chicken: A History of America's Favorite Bird. Wiley. ISBN 978-1-68177-163-2. Retrieved 25 August 2016.
- "The History Of Incubation". Pleysier. Retrieved 7 September 2013.