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A scleroscope is a device used to measure rebound hardness. It consists of a steel ball dropped from a fixed height. The device was invented in 1907. As an improvement on this rough method, the Leeb Rebound Hardness Test, invented in the 1970s, uses the ratio of impact and rebound velocities (as measured by a magnetic inducer) to determine hardness
According to the dynamic Leeb principle, the hardness value is derived from the energy loss of a defined impact body after impacting on a metal sample, similar to the Shore scleroscope. The Leeb quotient ( v i , v r ) is taken as a measure of the energy loss by plastic deformation: the impact body rebounds faster from harder test samples than ...
The sclerometer, also known as the Turner-sclerometer (from Ancient Greek: σκληρός meaning "hard"), is an instrument used by metallurgists, material scientists and mineralogists to measure the scratch hardness of materials.
A stone sculpture is an object made of stone which has been shaped, usually by carving, or assembled to form a visually interesting three-dimensional shape. Stone is more durable than most alternative materials, making it especially important in architectural sculpture on the outside of buildings.
English: Scanning electron microscope image of paper made from calcium carbonate (like chalk) and resin to make what is sometimes called stone paper. This image was created in 2007 by Charles Kaziek as part of the science and art fusion collaborative called the Paper Project. Image magnification - 1,000X.
The milder the acid, the longer it takes to etch calcite-based stone; stronger acids can cause irreparable damage in seconds. Picture Framing occurs when water or grout moves into the edges of the stone to create an unsightly darkening or "frame" affect. Such harm is usually irreversible.
A touchstone is a small tablet of dark stone such as slate or lydite, used for assaying precious metal alloys.
Lithophane of Frederick the Great, lit from front.After a well known painting by Julius Schrader (1849). [1] The same lithophane, backlit. A lithophane is a thin plaque of translucent material, normally porcelain, which has been moulded to varying thickness, such that when lit from behind the different thicknesses show as different shades, forming an image.