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Retort stand. In chemistry, a retort stand, also called a clamp stand, [1] a ring stand, [2] or a support stand, [3] is a piece of scientific equipment intended to support other pieces of equipment and glassware — for instance, burettes, test tubes and flasks. [4] The typical ring stand consists of a heavy base and a vertical rod, both ...
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PAR lights have seen heavy use in rock and roll shows, especially those with smaller budgets, due to their low cost, light weight, easy maintenance, high durability, and high output. [7] They are often used in combination with smoke or haze machines which make the path of the beam visible.