(2) Tables A-1 through A-4 in Appendix A (pages A-1 through A-4) provide the logarithms of
numbers. These tables are not typical logarithm tables. The tables consist of two columns marked A and
B.
Ra
T
or b .
Column A is the quotient of
Rb
Ta
EXAMPLE: A reading of 200 was taken at 0700 and another reading of 15 was taken at 1130. H-hour
was determined to be 050600Z. What is the decay factor n? Thus,
200
log
15 log 13.3 log 1.124 1.7
n
4.5
log 4.5
0.653
log
1
NOTE: See Appendix C for rounding rules.
The logarithm of either quotient is found in Column B. Note that Column A is given to one decimal place
only. To use the table, round the quotient to the nearest single decimal place and locate that number in
Column A. Read the logarithm of that number in Column B.
EXAMPLE: 10 divided by 6 equals 1.666666667. This number is not listed in Column A. Therefore,
round to 1.7. Enter Column A with 1.7. Determine the logarithm from Column B to be 0.230.
CM2306
4-12
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