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226:) the compass along the plane being measured. Dip is taken by laying the side of the compass perpendicular to the strike measurement and rotating horizontal level until the bubble is stable and the reading has been made. If field conditions allow, additional features of the compass allow users to measure such geological attributes from a distance.
202:. Holding the compass at waist-height, the user looks down into the mirror and lines up the target, needle, and guide line that is on the mirror. Once all three are lined up and the compass is level, the reading for that azimuth can be made. Arguably the most frequent use for the Brunton in the field is the calculation of the
153:
rather than fluid to damp needle oscillation. Although
Brunton, Inc. makes many other types of magnetic compasses, the Brunton Pocket Transit is a specialized instrument used widely by those needing to make accurate navigational and slope-angle measurements in the field. Users are primarily
261:
is one example. Portable electronic devices are changing the way geologists conduct field work. Unlike analogue compasses, a digital compass relies on an accelerometer and a
149:. The instrument was patented in 1894 by Canadian-born geologist David W. Brunton. Unlike most modern compasses, the Brunton Pocket Transit utilizes
265:, and may provide information about the reliability of a measurement (e.g. by repeating the same measurement and performing statistical analysis).
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233:. Thus, measurements are sensitive to magnetic interference. For example, if the user is near an outcrop that contains
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to tens of yards away (depending on the strength of the magnetic field). Since they are measured with a rotating
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according to one's location on the Earth. It is used to get directional degree measurements (
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241:-bearing material, compass readings can be affected anywhere from several inches from the
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As with most traditional compasses, directional measurements are made in reference to the
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has adopted the Pocket
Transit as the M2 Compass for use by crew-served
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304:, Guilford, CT: The Globe Pequot Press, (1997) ISBN 0-7627-0488-0, p. 4
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Assaad, Fakhry A.; LaMoreaux, James W.; Hughes, Travis, eds. (2013).
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249:, dip measurements are unaffected by magnetic interference.
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Precision compass made by
Brunton, Inc. of Riverton, Wyoming
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There are numerous other compasses used by geologists: The
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320:. Springer Science & Business Media. pp. 38–39.
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222:, etc.). Strike is measured by leveling (with the
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A standard
Brunton Geo, used commonly by geologists
49:. Unsourced material may be challenged and removed.
174:also make use of the Brunton's capabilities. The
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317:Field Methods for Geologists and Hydrogeologists
387:
394:
380:
277:Measuring vertical angles with clinometer
109:Learn how and when to remove this message
120:
190:The Pocket Transit may be adjusted for
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401:
375:
362:Easy explanation how to use a Brunton
280:Defining points of the same elevation
47:adding citations to reliable sources
18:
637:List of tectonic plate interactions
367:Introduction to the Brunton Compass
13:
252:
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34:needs additional citations for
357:How to use the Brunton compass
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151:magnetic induction damping
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722:Thick-skinned deformation
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302:Compass and Map Navigator
283:Measuring strike and dip.
727:Thin-skinned deformation
503:Stereographic projection
133:, properly known as the
493:Orthographic projection
476:Measurement conventions
422:Lamé's stress ellipsoid
268:
164:environmental engineers
231:Earth's magnetic field
200:Earth's magnetic field
135:Brunton Pocket Transit
126:
1004:Paleostress inversion
697:Strike-slip tectonics
567:Extensional tectonics
547:Continental collision
417:Deformation mechanism
198:) through use of the
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582:Fold and thrust belt
43:improve this article
1091:Canadian inventions
1014:Section restoration
890:Rock microstructure
552:Convergent boundary
452:Strain partitioning
437:Overburden pressure
427:Mohr–Coulomb theory
352:The Brunton company
1081:Structural geology
991:Kinematic analysis
647:Mountain formation
562:Divergent boundary
527:Accretionary wedge
403:Structural geology
300:Hodgson, Michael,
259:Breithaupt compass
220:sedimentary strata
176:United States Army
127:
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999:3D fold evolution
885:Pressure solution
880:Oblique foliation
760:Exfoliation joint
750:Columnar jointing
410:Underlying theory
327:978-3-662-05438-3
192:declination angle
147:Riverton, Wyoming
137:, is a precision
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58:"Brunton compass"
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803:Detachment fault
798:Cataclastic rock
732:Thrust tectonics
702:Structural basin
677:Pull-apart basin
617:Horst and graben
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274:Taking a bearing
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813:Fault mechanics
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622:Intra-arc basin
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60: –
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54:Find sources:
48:
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38:
37:
32:This article
30:
26:
21:
20:
828:Thrust fault
517:Large-scale
488:Inclinometer
482:
462:Stress field
331:. Retrieved
316:
309:
301:
296:
263:magnetometer
256:
228:
214:, contacts,
189:
134:
130:
128:
105:
99:January 2017
96:
86:
79:
72:
65:
53:
41:Please help
36:verification
33:
1009:Paleostress
895:Slickenside
870:Crenulation
823:Fault trace
818:Fault scarp
808:Disturbance
793:Cataclasite
682:Rift valley
602:Half-graben
572:Fault block
557:DĂ©collement
1075:Categories
1037:Pure shear
1024:Shear zone
981:Competence
865:Compaction
742:Fracturing
537:Autochthon
532:Allochthon
288:References
210:features (
208:geological
156:geologists
69:newspapers
1086:Surveying
973:Boudinage
953:Monocline
948:Homocline
928:Anticline
910:Tectonite
900:Stylolite
875:Fissility
852:lineation
848:Foliation
712:Syneclise
657:Obduction
627:Inversion
519:tectonics
235:magnetite
216:foliation
180:artillery
172:surveyors
1060:Category
1032:Mylonite
963:Vergence
958:Syncline
860:Cleavage
785:Faulting
186:Overview
141:made by
933:Chevron
920:Folding
765:Fissure
717:Terrane
662:Orogeny
642:MĂ©lange
577:Fenster
467:Tension
333:10 June
243:outcrop
196:azimuth
139:compass
83:scholar
707:Suture
692:Saddle
632:Klippe
597:Graben
457:Stress
447:Strain
324:
212:faults
158:, but
85:
78:
71:
64:
56:
1042:Shear
770:Joint
652:Nappe
612:Horst
607:Horse
247:level
90:JSTOR
76:books
943:Dome
850:and
775:Vein
755:Dike
687:Rift
498:Rake
335:2015
322:ISBN
269:Uses
239:iron
170:and
62:news
206:of
145:of
45:by
1077::
218:,
182:.
166:,
162:,
129:A
395:e
388:t
381:v
337:.
112:)
106:(
101:)
97:(
87:·
80:·
73:·
66:·
39:.
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