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2. Schmidt hammer - Wikipedia

   en.wikipedia.org/wiki/Schmidt_hammer

   A Schmidt hammer, [1] also known as a Swiss hammer or a rebound hammer or concrete hammer test, is a device to measure the elastic properties or strength of concrete or rock, mainly surface hardness and penetration resistance. It was invented by Ernst Heinrich Wilhelm Schmidt, a Swiss engineer. [2] The hammer measures the rebound of a spring ...

3. Bicep curl - Wikipedia

   en.wikipedia.org/wiki/Bicep_curl

   Typically, a bicep curl begins with the arm fully extended with a supinated (palms facing up) grip on a weight. A full repetition consists of bending or "curling" the elbow until it is fully flexed, then slowly lowering the weight to the starting position. The torso should remain upright instead of swinging back and forth, as doing so transfers ...

4. I Used This Weight Rack for Almost All My Workouts for a Year

   www.aol.com/lifestyle/used-weight-rack-almost...

   The Hammer Strength HD Athletic NX Half Rack Specs. Since this is a half-rack, it doesn’t take up as much square footage as many full cage-style power racks, which feature a closed design with a ...

5. Jackhammer - Wikipedia

   en.wikipedia.org/wiki/Jackhammer

   A jackhammer (pneumatic drill or demolition hammer in British English) is a pneumatic or electro-mechanical tool that combines a hammer directly with a chisel. It was invented by William McReavy, who then sold the patent to Charles Brady King. [ 1 ] Hand-held jackhammers are generally powered by compressed air, but some are also powered by ...

6. Military tactics of Alexander the Great - Wikipedia

   en.wikipedia.org/wiki/Military_tactics_of...

   The military tactics of Alexander the Great (356 BC - 323 BC) have been widely regarded as evidence that he was one of the greatest generals in history. During the Battle of Chaeronea (338 BC), won against the Athenian and Theban armies, and the battles of Granicius (334 BC) and of Issus (333 BC), won against the Achaemenid Persian army of Darius III, Alexander employed the so-called "hammer ...

7. Powder-actuated tool - Wikipedia

   en.wikipedia.org/wiki/Powder-actuated_tool

   A powder-actuated tool (PAT, often generically called a Hilti gun or a Ramset gun after their manufacturing companies) is a type of nail gun used in construction and manufacturing to join materials to hard substrates such as steel and concrete. Known as direct fastening or explosive fastening, this technology is powered by a controlled ...