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  2. Level staff - Wikipedia

    en.wikipedia.org/wiki/Level_staff

    Level staff. A level staff, also called levelling rod, is a graduated wooden or aluminium rod, used with a levelling instrument to determine the difference in height between points or heights of points above a vertical datum. When used for stadiametric rangefinding, the level staff is called a stadia rod.

  3. Level (optical instrument) - Wikipedia

    en.wikipedia.org/wiki/Level_(optical_instrument)

    Level (optical instrument) A level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling. It is used in conjunction with a levelling staff to establish the relative height or levels (the vertical separation) of objects or marks. It is widely used in surveying and construction to ...

  4. Cabinetry - Wikipedia

    en.wikipedia.org/wiki/Cabinetry

    A type of adjustable leg has been adopted from the European cabinet system which offers several advantages. First off, in making base cabinets for kitchens, the cabinet sides would be cut to 34½ inches, yielding four cabinet side blanks per 4 foot by 8 foot sheet. Using the adjustable feet, the side blanks are cut to 30 inches, thus yielding ...

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  6. Differential screw - Wikipedia

    en.wikipedia.org/wiki/Differential_screw

    Differential screw leveling feet, drawing by Joshua Rose, 1887. A differential screw is a mechanism used for making small, precise adjustments to the spacing between two objects (such as in focusing a microscope, [2] moving the anvils of a micrometer, [3][4] or positioning optics [5]). A differential screw uses a spindle with two screw threads ...

  7. Levelling - Wikipedia

    en.wikipedia.org/wiki/Levelling

    Levelling or leveling (American English; see spelling differences) is a branch of surveying, the object of which is to establish or verify or measure the height of specified points relative to a datum. It is widely used in geodesy and cartography to measure vertical position with respect to a vertical datum, and in construction to measure ...