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2. Jackscrew - Wikipedia

   en.wikipedia.org/wiki/Jackscrew

   The maximum mechanical advantage possible for a hydraulic jack is not limited by the limitations on screw jacks and can be far greater. After World War II, improvements to the grinding of hydraulic rams and the use of O ring seals reduced the price of low-cost hydraulic jacks and they became widespread for use with domestic cars.

3. Jack (device) - Wikipedia

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

   A 2.5-ton house jack that stands 24 inches from top to bottom fully threaded out. A house jack, also called a screw jack, is a mechanical device primarily used to lift buildings from their foundations for repairs or relocation. A series of jacks is used and then wood cribbing temporarily supports the structure. This process is repeated until ...

4. Roasting jack - Wikipedia

   en.wikipedia.org/wiki/Roasting_jack

   Illustration of a bottle jack from Mrs Beeton's Book of Household Management. A roasting jack is a machine which rotates meat roasting on a spit. [1] It can also be called a spit jack, a spit engine or a turnspit, although this name can also refer to a human turning the spit, or a turnspit dog. [2]

5. J. Chein & Company - Wikipedia

   en.wikipedia.org/wiki/J._Chein_&_Company

   It is best remembered today for its mechanical toys made from stamped and lithographed tin produced from the 1930s through the 1950s. Founded by Julius Chein in a loft in New York City, Chein's earliest toy production was a line of premiums for the Cracker Jacks snack line.

6. Pallet jack - Wikipedia

   en.wikipedia.org/wiki/Pallet_jack

   Typical manual pallet jack (lowered) A pallet jack, also known as a pallet truck or pallet pump, is a tool used to lift and move pallets.Pallet jacks are the most basic form of a forklift [1] and are intended to move palletized loads within warehouses, distribution centers, retail stores, and construction sites.

7. Jumping jack (toy) - Wikipedia

   en.wikipedia.org/wiki/Jumping_jack_(toy)

   A jumping jack toy, c.1850. The jumping jack is a jointed, flat wooden figure, a cross between a puppet and a paper doll that is considered a mechanical toy. The figure's joints are connected to a pull string that causes the arms and legs to move up and down when the string is pulled and released. Jumping jacks were popular in many contemporary ...