Podcast
Questions and Answers
Which component of a leveling instrument is used for precise aiming at a target?
Which component of a leveling instrument is used for precise aiming at a target?
- Leveling screw
- Circular bubble
- Slow-motion screw
- Rifle sight (correct)
What is the main purpose of the leveling screws on a leveling instrument?
What is the main purpose of the leveling screws on a leveling instrument?
- To focus the reticule
- To control the slow motion of the instrument
- To adjust the magnification of the telescope
- To precisely level the instrument (correct)
What is the function of the reticule within a leveling instrument's telescope?
What is the function of the reticule within a leveling instrument's telescope?
- To magnify the image of the target
- To measure distances directly
- To stabilize the telescope during movement
- To provide cross wires for accurate sighting (correct)
What should the level tangent (LL) be when a leveling instrument is correctly set up?
What should the level tangent (LL) be when a leveling instrument is correctly set up?
What is the significance of the vertical axis (VV) in a leveling instrument?
What is the significance of the vertical axis (VV) in a leveling instrument?
The sight axis (SS) of a leveling instrument is established by the center of the objective lens of the telescope and what other point?
The sight axis (SS) of a leveling instrument is established by the center of the objective lens of the telescope and what other point?
What characteristic distinguishes a tilting level from other types of levels?
What characteristic distinguishes a tilting level from other types of levels?
Which type of leveling instrument incorporates a compensator to automatically adjust for small tilts?
Which type of leveling instrument incorporates a compensator to automatically adjust for small tilts?
What technology is used by an electronic level to measure elevation differences?
What technology is used by an electronic level to measure elevation differences?
Leveling staffs (rods) are graduated in what units?
Leveling staffs (rods) are graduated in what units?
What materials are leveling staffs typically made from?
What materials are leveling staffs typically made from?
What is a key feature commonly found on leveling staffs?
What is a key feature commonly found on leveling staffs?
What is the main purpose of tripods in leveling?
What is the main purpose of tripods in leveling?
Which of the following is a guideline for reading the manuals of leveling instruments?
Which of the following is a guideline for reading the manuals of leveling instruments?
What is an important precaution to take when using a tripod with extending legs?
What is an important precaution to take when using a tripod with extending legs?
Why should you avoid using force when handling a leveling instrument?
Why should you avoid using force when handling a leveling instrument?
Why is it important to avoid touching the lenses of a leveling instrument with your fingers?
Why is it important to avoid touching the lenses of a leveling instrument with your fingers?
What should be considered when the staff is near a level?
What should be considered when the staff is near a level?
Approximately how long is a leveling staff?
Approximately how long is a leveling staff?
What is the most important reason to prevent the instruments from being exposed to water?
What is the most important reason to prevent the instruments from being exposed to water?
Flashcards
What is a Level?
What is a Level?
Instrument used to measure elevation differences.
What is the Reticule?
What is the Reticule?
Part of a leveling instrument, used for sighting.
What is the Level Tangent?
What is the Level Tangent?
Keeps the level in a horizontal position when set up.
What is a Vertical Axis?
What is a Vertical Axis?
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What is the Sight Axis?
What is the Sight Axis?
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What is a Dumpy Level?
What is a Dumpy Level?
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What is a Tilting Level?
What is a Tilting Level?
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What are Automatic Levels?
What are Automatic Levels?
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What is an Electronic Level?
What is an Electronic Level?
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What are Leveling Staffs (Rods)?
What are Leveling Staffs (Rods)?
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What are Tripods?
What are Tripods?
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What are Dual Strut Supports?
What are Dual Strut Supports?
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Study Notes
Leveling Instruments
- The level is an instrument used to measure elevation differences
- Instruments consist of a telescope, rifle sight, leveling device (circular bubble or tube level and typically 3 leveling screws), slow-motion screw, reticule with cross wires for sighting (inside the telescope), and screws for cross wires and target focusing.
Instrument Axes
- Level tangent LL should be in a horizontal position when the instrument is properly set up
- Vertical axis VV is what the level rotates about, it runs perpendicular to the level tangent, and coincides with the direction of gravity when the instrument is set up
- Sight axis SS is established by the center of the objective lens of the telescope and the center of the cross-hair, runs perpendicular to the vertical axis, and moves in a horizontal plane when the instrument is rotated
Types of Levels
- Dumpy Level is an old model with 4 leveling screws and an inverting eyepiece
- Tilting Level's telescope can be tilted about a horizontal axis and has an additional tube level attached to the telescope that must be leveled before any reading
- Automatic Level is modern and has a compensator mechanism that automatically adjusts small tilts in the sight axis
- Electronic Level uses a bar-code graduated staff and laser beam to measure the elevation difference
Accessories
- Leveling Staffs (Rods) are graduated in feet, meters, or bar codes and can be made from wood (with or without polymer coating), aluminum, or Invar
- Leveling Staffs can be folding, fixed, or telescopic
- Some models have a circular bubble attached
- Tripods are made of wood or aluminum and have telescopic or fixed legs
- Ground plates and dual strut supports are also accessories
Cross Hairs
- Instruments use cross hair (cross wires)
- These consist of vertical cross wires, stadia wires, and horizontal cross wires, as well as an optical inspection of compensator
Instrument Care
- Read all manuals before using
- Always protect all instruments and accessories from hazards
- If using a tripod with extending legs, ensure the screws of the legs are tightened
- Never leave the instrument on top of the tripod head untied
- Refrain from using force, handle it gently and carefully
- Instruments must be left unattended
- Be careful when walking with the staff near the level
- Staves are 3-4 m long
- Keep electricity wires away from the staff
- Refrain from touching the lenses; they should be perfectly clean
- Despite some being waterproof, avoid exposing the instruments to water
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