To preserve that meat and fish should not be rotting needed ice. In 1755 by Dr. William Cullen created for the First ayang ice machine is simple, then it repaired creations of others. In 1845 emerged a refrigeration machine that can cool a small room in a long time. It happened in New Orleans, Louisiana. This peneruan then tried the meat to a transport ship that sailed from Australia to the UK.
Various cooling device is made of people. The working principle of a cold engine is based on the idea, THAT would be a hot gas when compressed. If the compressed gas outlet deberi seek opportunities it will cool. Thus the first gas dimamptakan.
Then passed a cold coil. From this hot gas was emitted and relate to the outside air. Now it becomes a cold gas and into the cooler and it was there he was floating. In this way can in apai seuatu cold conditions that can make the water freeze. On the basis of this is done for refrigerators. Now the big trucks, trains and ships can bring food to all parts of the world with the use of refrigeration.
Source: Kitab Emas"Penemuan-penemuan Dulu sampai Sekarang"
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