background image

Strike & dip measurements are planar measurements
taken when direct contact is made with the outcropping.

5.1  Strike Measurement

Strike is the direction of a line that is formed by an inter-
section of an imaginary horizontal plane and an inclined
surface that is being measured.

1.  Open both the cover and large sight until both extend in

a straight line.

2. Place transit along a horizontal line on the inclined rock

surface.  (Fig 26)

Hint:  Place on a writing tablet to extend the horizontal line.

3. Hold level by centering bubble in the round level.
4.  Read strike angle at either the “

N

” or “

S

” tip.  

Some people recommend the strike measurement be the largest angle out of “

N

” and “

S

”, so

that there is no confusion between the strike and dip angle.

5.2  Dip Measurement

Dip is the vertical angle (inclination) of the rock surface, measured from horizontal.

1.  Open the cover and large sight until they both extend in a straight line.

4.2.a  Height Measurement Using Vertical Angles

1.  Sight inclination, as described in section 4.2.
2.  Apply height calculation as shown in figure 24A or 24B.

Note: Do not

calculate tangent of an angle by adding tangents of two smaller angles.

Example: Tan(60°) 

Tan(30°) + Tan(30°)  Find Tan(60°) from a table, use a calculator, or

step back until angle of inclination is less than 45°, then use tangent table on the GEO lid.

4.2.b  Height Measurements Using % Grade

1.  Sight % grade using level or sloping ground, same as in Figures 24A & 24B

.

2.  Apply height calculation, as show in figures 25A & 25B.

14

13

Below Object Base

Height = (TanA - TanB) x Distance

Example:  A = 38

°

, B = 10

°

& Distance = 75 ft.

Height = (Tan38

°

- Tan10

°

) x 75’

Height = (.781 - .176) x 75’
Height = (.605) x 75’

Height = 45.38 ft. 

= 45’

Above Object Base

Height = (TanA + TanB) x Distance

Example:  A = 36

°

, B = 10

°

& Distance = 50 ft.

Height = (Tan36

°

+ Tan10

°

) x 50’

Height = (.727 + .176) x 50’
Height = (.903) x 50’

Height = 45.15 ft. 

= 45’

Above Object Base

Height = (A + B) x Distance

Example:  A = 72.7%, B = 17.6% & Distance = 50 ft.
Height = (72.7% + 17.6%) x 50’
Height = (.903) x 50’

Height = 45.15 ft. 

= 45’

Below Object Base

Height = (A - B) x Distance

Example:  A = 78.1%, B = 17.6% & Distance = 75 ft.
Height = (78.1%  - 17.6%) x 75’
Height = (.605) x 75’

Height = 45.38 ft. 

= 45’

Figure 25A

Figure 25B

Figure 24A

Figure 24B

Height Measurement

Above Object Base

Height Measurement

Below Object Base

Figure 26

5 -- Strike & Dip Measurement

Содержание GeoTransit

Страница 1: ...tional Measurements 18 9 Prospecting 19 10 Reference Material 25 11 Specifications 26 12 Service 26 i Copyright BRUNTON 2001 Printed in U S A form 11 GEO rev 0109 Owner s Purchase Record Model _______...

Страница 2: ...h is induction damped allowing the needle to seek magnetic north and come to a complete rest in a minimum amount of time 1 3 Graduated Circle Fig 2 In combination with the needle the 1 graduated circl...

Страница 3: ...ng Why are EAST WEST switched The GEO Transit is a direct reading compass Read azimuth directly where the needle points on the graduated circle With the large sight toward the object read azimuth dire...

Страница 4: ...ca only Use the isogonic chart a current United States Geological Survey USGS Bureau of Land Management BLM another map or a computer program to determine magnetic declination at your position Declina...

Страница 5: ...st declination rotate graduated circle clockwise from the zero pin Fig 9A For West declination rotate graduated circle count er clockwise Fig 9B If magnetic declination is 0 no adjustment is necessary...

Страница 6: ...er the body 4 Press left forearm against your waist and steady with right hand 5 Look just over the large sight and at the object through window opening on mirror Fig 16 Adjust mirror and large sight...

Страница 7: ...bubble is centered in the long level 6 Read inclination at vernier s center line The Brunton GEO Transit is capable of measuring vertical angles with an accuracy better than 1 with readings to 10 min...

Страница 8: ...ly height calculation as shown in figure 24A or 24B Note Do not calculate tangent of an angle by adding tangents of two smaller angles Example Tan 60 Tan 30 Tan 30 Find Tan 60 from a table use a calcu...

Страница 9: ...on its side and along on the rock surface so the vernier scale is at the bottom Fig 27 3 Adjust vernier until bubble is centered in long level 4 Read dip angle at the vernier s center line bottom sca...

Страница 10: ...the GEO transit 1 On a USGS topographic map place a point at a starting position and an X at a destination 2 Draw a line connecting both marks 3 At the starting point draw a true north line Fig 31 Use...

Страница 11: ...d center of each side line NRS 517 030 4 Within 90 days of posting the location notice prepare two copies of a claim map scale of 500 feet to the inch showing the position of the claim monuments the r...

Страница 12: ...ck pile 4 feet in diameter and 4 feet high or a steel post 3 inches in diameter and 5 feet high The description must also include the sec tion township and range The map need not be perfect but in acc...

Страница 13: ...township and range It is marked so that it must be read while standing on the south side of the monu ment The south side of the monument is marked with the date of the monument Fig 36 9 3 Sample Claim...

Страница 14: ...inning at Corner 1 NE corner Thence 600 feet 290 to Corner 2 Thence 1 500 feet 200 to Corner 3 Thence 600 feet 110 to Corner 4 Thence 1 500 feet 10 to Corner 1 Inches 1 8 1 4 3 8 1 2 5 8 3 4 7 8 1 2 3...

Страница 15: ......

Страница 16: ..._________________ Serial _____________________________ Date Purchased ____________________ Store _______________________________ City _______________________________ State _________ Zip ______________...

Страница 17: ...urn Authorization Number RA and send the unit to the address below Include a brief description of the problem Loss is not covered by this warranty Any repair to the unit must be done by a Brunton auth...

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