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@phanhuungo1: Cụm quạt không chổi than dùng điện 12 tới 24 V có luôn điều tóc và remote điều khiển từ xa ##quatkhongchoithan

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Tuesday 23 September 2025 03:49:16 GMT
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This clip shows the fascinating mechanics of a lewis bolt (sometimes called a lewis pin or stone lewis), an ancient lifting tool used by stonemasons for thousands of years. From the Romans to the builders of medieval cathedrals, this ingenious device allowed massive blocks of stone to be hoisted into place using the stone's own weight against it. The tool works by exploiting a trapezoidal or dovetail cutout carved into the top of a stone block. Two outer, wedge-shaped metal legs are placed into the sides of the hole, and a straight center piece is inserted between them to push the wedges tight against the inside walls. When a shackle is attached and lifted, the upward force converts into intense outward lateral pressure, gripping the stone securely. This simple mechanism entirely eliminates the need for lifting straps or chains wrapped around the block, allowing stonemasons to perfectly seat heavy stones directly next to one another. It is a timeless piece of engineering that demonstrates how fundamental mechanical principles can solve massive structural challenges. #engineering #ancient #stonemasonry #physics #Science
This clip shows the fascinating mechanics of a lewis bolt (sometimes called a lewis pin or stone lewis), an ancient lifting tool used by stonemasons for thousands of years. From the Romans to the builders of medieval cathedrals, this ingenious device allowed massive blocks of stone to be hoisted into place using the stone's own weight against it. The tool works by exploiting a trapezoidal or dovetail cutout carved into the top of a stone block. Two outer, wedge-shaped metal legs are placed into the sides of the hole, and a straight center piece is inserted between them to push the wedges tight against the inside walls. When a shackle is attached and lifted, the upward force converts into intense outward lateral pressure, gripping the stone securely. This simple mechanism entirely eliminates the need for lifting straps or chains wrapped around the block, allowing stonemasons to perfectly seat heavy stones directly next to one another. It is a timeless piece of engineering that demonstrates how fundamental mechanical principles can solve massive structural challenges. #engineering #ancient #stonemasonry #physics #Science
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