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  2. 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 ...

  3. List of measuring instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_measuring_instruments

    In the past, a common time measuring instrument was the sundial. Today, the usual measuring instruments for time are clocks and watches. For highly accurate measurement of time an atomic clock is used. Stopwatches are also used to measure time in some sports.

  4. Levelling - Wikipedia

    en.wikipedia.org/wiki/Levelling

    The top mark is at 1,500 mm and the lower is at 1,345 mm; the distance between those two marks is 155 mm, yielding a distance to the rod of 15.5 m. Optical levelling , also known as spirit levelling and differential levelling , employs an optical level , which consists of a precision telescope with crosshairs and stadia marks .

  5. Category : Length, distance, or range measuring devices

    en.wikipedia.org/wiki/Category:Length,_distance...

    Pages in category "Length, distance, or range measuring devices" The following 60 pages are in this category, out of 60 total. This list may not reflect recent changes. *

  6. Category:Measuring instruments - Wikipedia

    en.wikipedia.org/wiki/Category:Measuring_instruments

    Pages in category "Measuring instruments" The following 200 pages are in this category, out of approximately 375 total. This list may not reflect recent changes .

  7. Category:Dimensional instruments - Wikipedia

    en.wikipedia.org/wiki/Category:Dimensional...

    Length, distance, or range measuring devices (4 C, 60 P) Pages in category "Dimensional instruments" The following 52 pages are in this category, out of 52 total.

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  9. 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).

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