measurment the true thickness of the beds in the field in different position and different dip angle using triangle rules.
dr, rabeea znad
department of geology
college of science
mosul university
iraq.
6. E-االتجا بنفس الطبقات وميل المنحدره
الطبقة ميل زاوية وكانت(X)من اكبر
المنحدر زاوية(Y)
تساوي المظللة الزاوية فان(X-Y)
الحقيقي السمك يكون وعلية(AC)
يساوي
Y)-×)AC =AB × Sin
x
C
A
B
X Y
11. N
If the declination of magnetic pole due to the east of geographic pole
Reading of compass
If declination 3⁰ due to east
If strike direction 300 which is reading from (red arrow)
We want to reading from N(Geographic Pole) so we added the declination value to the 300
Note: brown angle larger
than blue angle therefore
we must add.
12. If the declination of magnetic pole due to the west of geographic pole
300
If declination 3⁰ due to west
If strike direction 300 which is reading from (red arrow)
We want to reading from N(Geographic Pole) so we subtract the declination value from 300
Reading of compass
Note: brown angle smaller
than blue angle therefore
we must add.