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2. Wig wag (washing machines) - Wikipedia

   en.wikipedia.org/wiki/Wig_wag_(washing_machines)

   A vertical-axis washing machine has two mechanisms: a central agitator for washing and a drum for spinning, both driven by the same motor and controlled independently by clutches to the belt drive. The wig-wag is mounted atop the washing machine's transmission, where it oscillates back and forth like a railroad signaling wigwag (hence the name ...

3. Agitator (device) - Wikipedia

   en.wikipedia.org/wiki/Agitator_(device)

   The Dual-action is a two-part agitator that has bottom washer fins that move back and forth and a spiral top that rotates clockwise to help guide the clothes to the bottom washer fins. The modern agitator, which is dual-action, was first made in Kenmore Appliances washing machines in the 1980s to present. These agitators are known by the ...

4. Freezer burn - Wikipedia

   en.wikipedia.org/wiki/Freezer_burn

   Freezer burn appears as grayish-brown leathery spots on frozen food and occurs when air reaches the food's surface and dries the product. Color changes result from chemical changes in the food's pigment. Freezer burn does not make the food unsafe; it merely causes dry spots in foods. [2]

5. Industrial agitator - Wikipedia

   en.wikipedia.org/wiki/Industrial_agitator

   An agitator is composed of a drive device ( motor, gear reducer, belts…), a guiding system of the shaft (lantern fitted with bearings), a shaft and impellers . If the operating conditions are under high pressure or high temperature, the agitator must be equipped with a sealing system to keep tightened the inside of the tank when the shaft is ...

6. Einstein refrigerator - Wikipedia

   en.wikipedia.org/wiki/Einstein_refrigerator

   The Einstein–Szilard or Einstein refrigerator is an absorption refrigerator which has no moving parts, operates at constant pressure, and requires only a heat source to operate. It was jointly invented in 1926 by Albert Einstein and his former student Leó Szilárd , who patented it in the U.S. on November 11, 1930 ( U.S. patent 1,781,541 ).

7. Icebox - Wikipedia

   en.wikipedia.org/wiki/Icebox

   Using ice for cooling and preservation was not new at that time; the ice house was an introductory model for the modern icebox. [4] The traditional kitchen icebox dates back to the days of ice harvesting, which was commonly used from the mid-19th century until the introduction of the refrigerator for home use in the 1930s. Most municipally ...