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  2. Trisodium phosphate - Wikipedia

    en.wikipedia.org/wiki/Trisodium_phosphate

    TSP is still sold and used as a cleaning agent, but since the late 1960s, its use has diminished in the United States and many other parts of the world because, like many phosphate-based cleaners, it is known to cause extensive eutrophication of lakes and rivers once it enters a water system.

  3. Swimming pool sanitation - Wikipedia

    en.wikipedia.org/wiki/Swimming_pool_sanitation

    Rotational force the pool return jets create is the most important part of cleaning the pool water and pushing organic waste across the mouth of the skimmer. With a correctly designed and operated swimming pool, this circulation is visible and after a period of time, reaches even the deep end, inducing a low-velocity vortex above the main drain ...

  4. Geophysical Service - Wikipedia

    en.wikipedia.org/wiki/Geophysical_Service

    Geophysical Service Inc. (often abbreviated GSI) was a Texas-based company founded by John Clarence Karcher and Eugene McDermott in 1930, [1] for the purpose of using refraction and reflection seismology to explore for petroleum deposits.

  5. Geological Strength Index - Wikipedia

    en.wikipedia.org/wiki/Geological_Strength_Index

    The Geological Strength Index (GSI) system, proposed in 1994 by Evert Hoek, is used for the estimation of the rock mass strength and the rock mass deformation modulus.. The GSI system concentrates on the description of two factors, rock structure and block surface conditions.

  6. Janka hardness test - Wikipedia

    en.wikipedia.org/wiki/Janka_hardness_test

    The Janka hardness test (English: / ˈ dʒ æ ŋ k ə /; [1] German:), created by Austrian-born American researcher Gabriel Janka (1864–1932), measures the resistance of a sample of wood to denting and wear.

  7. Cedar oil - Wikipedia

    en.wikipedia.org/wiki/Cedar_oil

    Cedarwood essential oil. Cedar oil, also known as cedarwood oil, is an essential oil derived from various types of conifers, most in the pine or cypress botanical families.It is produced from the foliage, and sometimes the wood, roots, and stumps left after logging of trees for timber.