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  2. Optical computing - Wikipedia

    en.wikipedia.org/wiki/Optical_computing

    Such an optical transistor [6] [7] can be used to create optical logic gates, [7] which in turn are assembled into the higher level components of the computer's central processing unit (CPU). These will be nonlinear optical crystals used to manipulate light beams into controlling other light beams.

  3. Levelling - Wikipedia

    en.wikipedia.org/wiki/Levelling

    A wooden tripod holding an optical level is set up firmly on the ground. 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.

  4. 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 ...

  5. Theodolite - Wikipedia

    en.wikipedia.org/wiki/Theodolite

    The pibal theodolite uses a prism to bend the optical path by 90 degrees so the operator's eye position does not change as the elevation is changed through a complete 180 degrees. The theodolite is typically mounted on a rugged steel stand, set up so it is level and pointed north, with the altitude and azimuth scales reading zero degrees.

  6. Glossary of levelling terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_levelling_terms

    The commonly used datum is mean sea level. [3] Dumpy level – optical instrument used to establish or check points in the same horizontal plane. It is used in surveying and building with a vertical staff to measure height differences and to transfer, measure and set heights. Also called a builder's level or leveling instrument.

  7. Spirit level - Wikipedia

    en.wikipedia.org/wiki/Spirit_level

    Combining a spirit level with an optical telescope results in a tilting level or dumpy level. [5] These leveling instruments as used in surveying to measure height differences over larger distances. A surveyor's leveling instrument has a spirit level mounted on a telescope (perhaps 30 power) with cross-hairs, itself mounted on a tripod. The ...

  8. What is an optical drive? A guide to how your computer reads ...

    www.aol.com/news/optical-drive-guide-computer...

    Optical drives let your computer read and interact with discs like CDs, DVDs, and Blu-rays. However, they're quickly becoming outdated.

  9. Tribrach (instrument) - Wikipedia

    en.wikipedia.org/wiki/Tribrach_(instrument)

    Looking through the optical plummet pick up two of the tripod legs and position the cross-hairs over the marker. Tread all three legs into the grass, bitumen, concrete. Look through the optical plummet and using the thumbscrews put the cross-hairs back over the marker. Adjust the level of the tribrach by slackening the tripod screws and sliding ...