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2. British Association screw threads - Wikipedia

   en.wikipedia.org/wiki/British_Association_screw...

   A 2BA thread is used to connect the metal barrel of a dart to its shaft — as such, it is one of the few common uses of this thread in North America. In the UK, 2BA threads are commonly found in the old imperial British Engineering Standards Association (BESA) conduit boxes , and 4BA threads in light switch and socket back boxes which are ...

3. Hardness comparison - Wikipedia

   en.wikipedia.org/wiki/Hardness_comparison

   ISO 18265: "Metallic materials — Conversion of hardness values" (2013) ASTM E140-12B(2019)e1: "Standard Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness" (2019)

4. Campbell diagram - Wikipedia

   en.wikipedia.org/wiki/Campbell_diagram

   Another critical speed at mode 4 is observed at 7810 rpm (130 Hz) in dangerous vicinity of nominal shaft speed, but it has 30% damping - enough to safely ignore it. Analytically computed values of eigenfrequencies as a function of the shaft's rotation speed. This case is also called "whirl speed map". [4] Such a chart can be used in turbine design.

5. Mom's Long Covid Turns Out to Be Necrotising Disease of the ...

   www.aol.com/moms-long-covid-turns-necrotising...

   A U.K. mom of three thought she had Long Covid — until doctors discovered that she had a necrotising disease that forced her into a coma.. The long health journey for Sam Lewis, 38, began in ...

6. Shaft (mechanical engineering) - Wikipedia

   en.wikipedia.org/wiki/Shaft_(mechanical_engineering)

   The following stresses are induced in the shafts. Shear stresses due to the transmission of torque (due to torsional load). Bending stresses (tensile or compressive) due to the forces acting upon the machine elements like gears and pulleys as well as the self weight of the shaft. Stresses due to combined torsional and bending loads.

7. 7 Signs Investing in Real Estate Will Set You Back Financially

   www.aol.com/7-signs-investing-real-estate...

   Real estate investing has historically seen high returns. Residential homes typically have lower returns than commercial properties, but they can still be valuable assets in many investment...