Laboratory Manual for Introductory Geology 4e

FIGURE 8.8 Using the azimuth method to describe the direction between two points.
300 310
320
330
340
350
0
010
020
030
040
050
060
290
Ludman-Marshak
070
080
N
300
320
340
315°
0
N
0°
020
045°
040
060
280
270
260
250
A
Azimuth Protractor
090 100
110
W
E
280
260
240
270° 090°
225° 135°
180°
080
120
100
B
240
230
220
200 210
150
140
130
120
160
S
220
200
S
180
160
140
190
180
170
C
(a) A simple compass.
(b) A compass with
azimuth markings.
(c) A circular protractor can be used to determine the direction
between points.
north than to east? On an azimuth compass (Fig. 8.8b), 0° or 360° is due north, 090°
due east, 180° due south, and 270° due west. The direction 045° is exactly halfway
between north and east. The direction of the needle in Figure 8.8b can be read as
032°, meaning that the direction from the white end of the needle to the red end
is 32° east of north.
EXERCISE 8.5
Giving Directions
Name:
Course:
Section:
Date:
Use the circular (azimuth) protractor from your geologic toolkit at the back of this manual to determine the directions
between the following pairs of points.
(a) ln the figure below, from A to C ° C to A ° B to C ° C to B °
A
N
B
(b) In Figure 8.4, from A to B °
(c) In Figure 8.7, what is the direction from the red star to the blue dot? °
(d) In Figure 8.7, what is the direction from the peak of Hall Hill near the southwest corner of the map to the
northernmost point of Skunk Pond? °
C
8.3 MAP ELEMENTS
209