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  2. Rock balancing - Wikipedia

    en.wikipedia.org/wiki/Rock_balancing

    Rock balancing (also stone balancing, or stacking) is a form of recreation or artistic expression in which rocks are piled in balanced stacks, often in a precarious manner. Conservationists and park services have expressed concerns that the arrangements of rocks can disrupt animal habitats, accelerate soil erosion, and misdirect hikers in areas ...

  3. Dry stone - Wikipedia

    en.wikipedia.org/wiki/Dry_stone

    Dry stone walls in the Yorkshire Dales, England. Dry stone, sometimes called drystack or, in Scotland, drystane, is a building method by which structures are constructed from stones without any mortar to bind them together. [1] A certain amount of binding is obtained through the use of carefully selected interlocking stones.

  4. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    The tube technology of the ANITA was superseded in June 1963 by the U.S. manufactured Friden EC-130, which had an all-transistor design, a stack of four 13-digit numbers displayed on a 5-inch (13 cm) cathode-ray tube (CRT), and introduced Reverse Polish Notation (RPN) to the calculator market for a price of $2200, which was about three times ...

  5. Hudson's equation - Wikipedia

    en.wikipedia.org/wiki/Hudson's_equation

    Hudson's equation, also known as Hudson formula, is an equation used by coastal engineers to calculate the minimum size of riprap (armourstone) required to provide satisfactory stability characteristics for rubble structures such as breakwaters under attack from storm wave conditions.

  6. Massive precut stone - Wikipedia

    en.wikipedia.org/wiki/Massive_precut_stone

    A difference from Pouillon was the use of MP stone in a dry-stone (mortar-free) "trilithic," trabeated system. [32] Eventually this building, Perraudin's other MP stone projects, and the architect's hands-on course in stone architecture would inspire renewed interest in massive precut stone construction, with a particular focus on social housing.

  7. Sett (paving) - Wikipedia

    en.wikipedia.org/wiki/Sett_(paving)

    A sett, also known as a block or Belgian block, [1] is a broadly rectangular quarried stone used in paving roads and walkways. [ 2 ] [ 3 ] Formerly in widespread use, particularly on steeper streets because setts provided horses' hooves with better grip than a smooth surface, they are now encountered more usually as decorative stone paving in ...

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