Basic Leveling Tools -V2
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Transcript of Basic Leveling Tools -V2
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Basic Leveling Tools -V2
M. S. MartinSept. 2005,Revised June 2009
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Hydrostatic Level
• Consisting of clear tube and working on the principle that water finds its own level.
• It’s critical that there are no air bubbles in the line.
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Spirit Level• All Carpenters have one in their
tool box.• Typically features slightly
curved glass tube, incompletely filled with liquid (yellow coloured) leaving a bubble in tube to indicate level line
• Items can be deemed level (horizontal plane) and plumb (vertical plane)
• It can also be used in set-out work. See next slide for an example of this.
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Line Level
• Spirit bubble as for other level
• Only to be used for approximate work
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Plumb Bob
• A pointed weight suspended from a string line. Used to give a “plumb line” or vertical reference point
• Examples on next slide
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Boning Rods• T-shaped timber, used
in sets of three to achieve a level line by sighting along them.
• Sometimes used for trench bases.
• Look at larger picture on next slide.
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Automatic Level / Dumpy Level
Base Plate
Horizontal Circle
Eye PieceCircular Bubble Sighting Pointer
Objective Lens
Focusing Knob
Fine Adjustment
Foot Screw
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Laser Level• Used similarly to a
Dumpy level.• But, where a dumpy has to
have two people to use it, one for the staff. A laser can be used with only one person.
• The staff itself incorporates the use of a receiver, to pick up signal from laser level line.
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A little History
This is a 1927 Survey Compass
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Dumpy Level by Baker• The simplest form of
leveling equipment, from the early 1900’s.
• Look at P11 in your student notes,you have a copy.
• The following slides show some other early equipment, from 1900 onwards.
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1927 Transit Level
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Gurley Theodolite
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Modern Theodolites are more like this one