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  2. Levelling - Wikipedia

    en.wikipedia.org/wiki/Levelling

    Turning is a term used when referring to moving the level to take an elevation shot from a different location. To "turn" the level, one must first take a reading and record the elevation of the point the rod is located on. While the rod is being kept in exactly the same location, the level is moved to a new location where the rod is still visible.

  3. Level (optical instrument) - Wikipedia

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

    The Y level or wye level is the oldest and bulkiest of the older style optical instruments. A low-powered telescope is placed in a pair of clamp mounts, and the instrument then leveled using a spirit level, which is mounted parallel to the main telescope. The term dumpy level (also builder's level) endures despite the evolution in design. They ...

  4. Level staff - Wikipedia

    en.wikipedia.org/wiki/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.

  5. Spirit level - Wikipedia

    en.wikipedia.org/wiki/Spirit_level

    A tubular spirit level A bull's eye spirit level mounted in a camera tripod. A spirit level, bubble level, or simply a level, is an instrument designed to indicate whether a surface is horizontal (level) or vertical . Two basic designs exist: tubular (or linear) and bull's eye (or circular).

  6. Laser level - Wikipedia

    en.wikipedia.org/wiki/Laser_level

    The concept of a laser level has been around since at least the early 1970s, [2] the original spinning-mirror design laser plane and line level was patented by the late 1980s, [3] and the compact lens-based laser line level (as produced by many tool manufacturers today) was patented in the late 1990s. It was invented by Oscar Soliz in the late ...

  7. Bull's eye level - Wikipedia

    en.wikipedia.org/wiki/Bull's_eye_level

    The plate level is then used, rotating it 90 degrees between readings to level the instrument more precisely. The Fell All-Way precision level, one of the first successful American made bull's eye levels for machine tool use, was invented by William B. Fell, Rockford, Illinois prior to World War II in 1939. [1]

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  9. Temporary adjustments of theodolites - Wikipedia

    en.wikipedia.org/wiki/Temporary_adjustments_of...

    Bring the level parallel to any two of the foot screws, by rotating the upper part of the instrument. The bubble is brought to the centre of the level tube by rotating both the foot screws either inward or outward. Rotate the upper part of the instrument through 180°, so the level is over the remaining foot screw.

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