Geology Reference
In-Depth Information
Table 10-4
Values of Effective Depth Based on Hydrometer and Sedimentation
Cylinder of Specified Sizes [1]
Hydrometer 151H
Hydrometer 152H
Actual
Hydrometer
Reading
Effective
Depth,
L
(cm)
Actual
Hydrometer
Reading
Effective
Depth,
L
(cm)
Actual
Hydrometer
Reading
Effective
Depth,
L
(cm)
1.000
16.3
0
16.3
31
11.2
1.001
16.0
1
16.1
32
11.1
1.002
15.8
2
16.0
33
10.9
1.003
15.5
3
15.8
34
10.7
1.004
15.2
4
15.6
35
10.6
1.005
15.0
5
15.5
36
10.4
1.006
14.7
6
15.3
37
10.2
1.007
14.4
7
15.2
38
10.1
1.008
14.2
8
15.0
39
9.9
1.009
13.9
9
14.8
40
9.7
1.010
13.7
10
14.7
41
9.6
1.011
13.4
11
14.5
42
9.4
1.012
13.1
12
14.3
43
9.2
1.013
12.9
13
14.2
44
9.1
1.014
12.6
14
14.0
45
8.9
1.015
12.3
15
13.8
46
8.8
1.016
12.1
16
13.7
47
8.6
1.017
11.8
17
13.5
48
8.4
1.018
11.5
18
13.3
49
8.3
1.019
11.3
19
13.2
50
8.1
1.020
11.0
20
13.0
51
7.9
1.021
10.7
21
12.9
52
7.8
1.022
10.5
22
12.7
53
7.6
1.023
10.2
23
12.5
54
7.4
1.024
10.0
24
12.4
55
7.3
1.025
9.7
25
12.2
56
7.1
1.026
9.4
26
12.0
57
7.0
1.027
9.2
27
11.9
58
6.8
1.028
8.9
28
11.7
59
6.6
1.029
8.6
29
11.5
60
6.5
1.030
8.4
30
11.4
1.031 8.1
1.032 7.8
1.033 7.6
1.034 7.3
1.035 7.0
1.036 6.8
1.037 6.5
1.038 6.2
Values of effective depth are calculated
from the equation:
Values used in calculating the values in
Table 10-4 are as follows:
For both hydrometers, 151H and 152H:
L
2
14.0 cm
V
B
67.0 cm
3
A
27.8 cm
2
For hydrometer 151H:
L
1
10.5 cm for a reading of 1.000
2.3 cm for a reading of 1.031
For hydrometer 152H:
L
1
10.5 cm for a reading of 0 g/litre
2.3 cm for a reading of 50 g/litre
L
L
1
1
2
L
2
V
B
A
>
1
>
2
where:
L
effective depth, cm
L
1
distance along the stem of the
hydrometer from the top of the
bulb to the mark for a hydrometer
reading, cm
L
2
overall length of the hydrometer
bulb, cm
V
B
volume of hydrometer bulb, cm
3
A
cross-sectional area of sedimenta-
tion cylinder, cm
2
128
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