Watch This Forgotten Technology: Man Lifts 20 Ton Block By Hand

4,000 years ago, Stone Age Britons raised the mysterious monument known as Stonehenge. Today, no one really knows how they moved and stood up those massive stones. It’s a scientific mystery this man swears he’s cracked. He’s building his own Stonehenge in his Flint Michigan backyard to prove it. Wally Wallington is not a scientist […]

Concrete Non-Destructive Testing – Schmidt’s Hammer

The Schmidt Hammer, also known as a Swiss Hammer or Sclerometer, is a portable measuring instrument for testing the elastic properties or force of concrete or stone, especially surface hardness and resistance to penetration. It was invented by the Swiss engineer Ernst O. Schmidt in the early 1950s and introduced to the market by Proceq. […]