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2. Caster - Wikipedia

   en.wikipedia.org/wiki/Caster

   However, the larger the diameter of a caster wheel, the higher the caster support arm must be. Either the base of a low-hanging object must be lifted higher above the wheels, or the casters must hang out to the sides straddling the low-hanging supported object. While rotating around the vertical shaft, swivel caster wheels sweep out a space.

3. Trapezoidal thread form - Wikipedia

   en.wikipedia.org/wiki/Trapezoidal_thread_form

   The trapezoidal metric thread form is similar to the Acme thread form, except the thread angle is 30°. [ 4 ] [ 5 ] [ 6 ] It is codified by DIN 103. [ 7 ] While metric screw threads are more prevalent worldwide than imperial threads for triangular thread forms, the imperially sized Acme threads predominate in the trapezoidal thread form.

4. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   The threaded pipes used in some plumbing installations for the delivery of fluids under pressure have a threaded section that is slightly conical. Examples are the NPT and BSP series. The seal provided by a threaded pipe joint is created when a tapered externally threaded end is tightened into an end with internal threads.

5. Leading wheel - Wikipedia

   en.wikipedia.org/wiki/Leading_wheel

   The leading wheels (boxed) on Pennsylvania Railroad 1737. The leading wheel or leading axle or pilot wheel of a steam locomotive is an unpowered wheel or axle located in front of the driving wheels. The axle or axles of the leading wheels are normally located on a leading truck. Leading wheels are used to help the locomotive negotiate curves ...

6. Wikipedia:Language learning centre/Word list - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Language...

   Drawing up a comprehensive list of words in English is important as a reference when learning a language as it will show the equivalent words you need to learn in the other language to achieve fluency.

7. History of the metre - Wikipedia

   en.wikipedia.org/wiki/History_of_the_metre

   It performed the first great deed dictated by the motto inscribed in the pediment of the splendid edifice that is the metric system: "A tous les temps, à tous les peuples" (For all times, to all peoples); and this deed consisted in the approval and distribution, among the governments of the states supporting the Metre Convention, of prototype ...