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  2. Topographic Abney level - Wikipedia

    en.wikipedia.org/wiki/Topographic_Abney_Level

    The Abney level is typically used at the eye height of the surveyor, either hand-held or mounted on a staff at that height. To measure lines on a particular slope, the desired angle or grade is first set on the level and then the surveyor sights through the sighting tube and brings the cross-hair in line with the bubble in the level while ...

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  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. Point shooting - Wikipedia

    en.wikipedia.org/wiki/Point_shooting

    Side view of handgun point shooting position. Point shooting (also known as target-[1] or threat-focused shooting, [2] intuitive shooting, instinctive shooting, subconscious tactical shooting, or hipfiring) is a practical shooting method where the shooter points a ranged weapon (typically a repeating firearm) at a target without relying on the use of sights to aim.

  6. Levelling - Wikipedia

    en.wikipedia.org/wiki/Levelling

    The level line of sight is 2. The surveyor looks through the eyepiece of telescope while an assistant holds a vertical level staff which is graduated in inches or centimeters. The level staff is placed vertically using a level, with its foot on the point for which the level measurement is required.

  7. Laser pointer - Wikipedia

    en.wikipedia.org/wiki/Laser_pointer

    Red (635 nm), blueish violet (445 nm), and green (520 nm) laser pointers. A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.

  8. Inclinometer - Wikipedia

    en.wikipedia.org/wiki/Inclinometer

    The Abney level is a handheld surveying instrument developed in the 1870s that includes a sighting tube and inclinometer, arranged so that the surveyor may align the sighting tube (and its crosshair) with the reflection of the bubble in the spirit level of the inclinometer when the line of sight is at the angle set on the inclinometer.

  9. Laser rangefinder - Wikipedia

    en.wikipedia.org/wiki/Laser_rangefinder

    They can also be used for military reconnaissance and engineering. Usually tanks use LRF to correct the direct shoot solution. Handheld military rangefinders operate at ranges of 2 km up to 25 km and are combined with binoculars or monoculars. When the rangefinder is equipped with a digital magnetic compass (DMC) and inclinometer it is capable ...

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