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  2. Spirit level - Wikipedia

    en.wikipedia.org/wiki/Spirit_level

    A line level is a level designed to hang on a builder's string line. The body of the level incorporates small hooks to allow it to attach and hang from the string line. The body is lightweight, so as not to weigh down the string line, it is also small in size as the string line in effect becomes the body; when the level is hung in the center of ...

  3. Laser line level - Wikipedia

    en.wikipedia.org/wiki/Laser_line_level

    A laser line level is a tool combining a spirit level and/or plumb bob with a laser to display an accurately horizontal or vertical illuminated line on a surface the laser line level is laid against. Laser line levels are used wherever accurate verticals and horizontals are required, typically in the construction and cabinetry industries.

  4. Plumb bob - Wikipedia

    en.wikipedia.org/wiki/Plumb_bob

    A plumb bob, plumb bob level, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical direction as a reference line, or plumb-line. It is a precursor to the spirit level and used to establish a vertical datum. It is typically made of stone, wood, or lead, but can also be made of other ...

  5. Line level - Wikipedia

    en.wikipedia.org/wiki/Line_level

    Voltage vs. time of sine waves at reference and line levels, with V RMS, V PK, and V PP marked for the +4dBu line level. A line level describes a line's nominal signal level as a ratio, expressed in decibels, against a standard reference voltage. The nominal level and the reference voltage against which it is expressed depend on the line level ...

  6. String line - Wikipedia

    en.wikipedia.org/wiki/String_line

    A string line is a tool made for the purpose of marking a straight line, level, or corner for construction purposes. when building foundations, string lines are hung on batter boards [1] View of crossed strings at batter boards. indicating corner of foundation.

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  8. Track geometry - Wikipedia

    en.wikipedia.org/wiki/Track_geometry

    The horizontal alignment (or alinement in the United States) is done by using a predefined length of string line (such as 62-foot in the US and 20 meters in Australia [5]) to measure along the gauge side of the reference rail. It is the distance (in inches or millimeters) from the midpoint of the string line to the gauge of the reference rail.

  9. Hallade method - Wikipedia

    en.wikipedia.org/wiki/Hallade_method

    The string, which is one full chord long, is then held taut with one end on two marks at each end of a chord, and the offset at the half chord mark measured. The versine of the chord, which is equal to this measured offset value can be calculated using the approximation of: