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Home > Art, Film & Photography > Surveying Instruments: Theodolite, Gyrotheodolite, Inclinometer, Gunter's Chain, Total Station, Surveyor's Wheel, Dumpy Level, Pentaprism
Surveying Instruments: Theodolite, Gyrotheodolite, Inclinometer, Gunter's Chain, Total Station, Surveyor's Wheel, Dumpy Level, Pentaprism

Surveying Instruments: Theodolite, Gyrotheodolite, Inclinometer, Gunter's Chain, Total Station, Surveyor's Wheel, Dumpy Level, Pentaprism


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About the Book

Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: Theodolite, Gyrotheodolite, Inclinometer, Gunter's Chain, Total Station, Surveyor's Wheel, Dumpy Level, Pentaprism, Laser Line Level, Ramsden Theodolite, Macrometer, Laser Scanning. Excerpt: Automatic level in use on a construction site Leveler for use by hand A dumpy level, builder's auto level, leveling instrument, or automatic level is an optical instrument used in surveying and building to transfer, measure, or set horizontal levels . The level instrument is set up on a tripod and, depending on the type, either roughly or accurately set to a leveled condition using footscrews (levelling screws). The operator looks through the eyepiece of the telescope while an assistant holds a tape measure or graduated staff vertical at the point under measurement. The instrument and staff are used to gather and/or transfer elevations (levels) during site surveys or building construction. Measurement generally starts from a benchmark with known height determined by a previous survey, or an arbitrary point with an assumed height. A dumpy level is an older-style instrument that requires skilled use to set accurately. The instrument requires to be set level (see spirit level ) in each quadrant, to ensure it is accurate through a full 360 traverse. Some dumpy levels will have a bubble level ensuring an accurate level. A variation on the dumpy and one that was often used by surveyors, where greater accuracy and error checking was required, is a tilting level . This instrument allows the telescope to be effectively flipped through 180, without rotating the head. The telescope is hinged to one side of the instrument's axis; flipping it involves lifting to the other side of the central axis (thereby inverting the telescope). This action effectively cancels out any errors introduced by poor se...


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Product Details
  • ISBN-13: 9781155496894
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Theodolite, Gyrotheodolite, Inclinometer, Gunter's Chain, Total Station, Surveyor's Wheel, Dumpy Level, Pentaprism
  • Width: 229 mm
  • ISBN-10: 1155496892
  • Publisher Date: 04 May 2010
  • Binding: Paperback
  • Spine Width: 3 mm
  • Weight: 91 gr


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Surveying Instruments: Theodolite, Gyrotheodolite, Inclinometer, Gunter's Chain, Total Station, Surveyor's Wheel, Dumpy Level, Pentaprism
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