The water bath used to date is well known and has about 1700 years of history.
The bath consists of simple cooking, but is also used as thermostatic baths in laboratories.
Originally, this equipment was designed approximately in the year 300d.C. by an Egyptian-Chaldean alchemist named Mary. It was better known as "The Jew."
Maria developed various equipment for sublimation, decantation, distillation and separation of materials, used in the alchemists' constant search for the philosopher's stone.
The concepts of heat were not introduced until the 16th century and the first thermometer was not idealized much later.