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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
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.
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.
View of a frame-maker's workshop, oil on canvas, circa 1900 The elaborate decoration on this frame may be made by adhering molded plaster pieces to the wood base.. A picture frame is a container that borders the perimeter of a picture, and is used for the protection, display, and visual appreciation of objects and imagery such as photographs, canvas paintings, drawings and prints, posters ...
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 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.
Opus reticulatum’s downfall was caused by the technique's weaknesses and the increased pressures from Rome to further streamline the construction process while maintaining their image. Reticulate work required the use of quoins for its edges usually made of brick or stone because it could not do on its own.
A touchstone is a small tablet of dark stone such as slate or lydite, used for assaying precious metal alloys.