In this video, a vintage 50-year-old Rockwell hardness tester, weighing over 80kg (176lbs), is restored. The machine employs mirrors, translucent scales, and old-style light bulbs to measure hardness ...

Knowing the type of aggregate in the concrete or asphalt to be cut influences the performance and selection of diamond blades and drill bits. Aggregate, the stone, gravel and sand used in concrete and ...

Water Encyclopedia "Encyclopedia of Water"An encyclopedia of life, science, history, and culture surrounding a single ...

When designing metal parts, it's important to specify their hardness. However, many engineers have only a shaky understanding of what hardness actually is, or how it's measured. There are good reasons ...