2
45: cube_root( 343 ) = 7
46: cube_root( .000715 ) = .0894
47: cube_root( .00715 ) = .193
48: cube_root( .0715 ) = .415
49: cube_root( .516 ) = .803
50: cube_root( 27.8 ) = 3.03
51: cube_root( 5.49 ) = 1.76
52: cube_root( 87.1 ) = 4.43

THE 1.5 AND 2/3 POWER

If the indicator is set over a given number on the A scale, the number
under the hair-line on the K scale is the 1.5 power of the given
number. If the indicator is set over a given number on the K scale, the
number under the hair-line on the A scale is the 2/3 power of the given
number.

COMBINATIONS OF PROCESSES

A slide rule is especially useful where some combination of processes is
necessary, like multiplying 3 numbers together and dividing by a third.
Operations of this sort may be performed in such a way that the final
answer is obtained immediately without finding intermediate results.

1. Multiplying several numbers together. For example, suppose it is
desired to multiply 4 * 8 * 6. Place the right-hand index of the C scale
over 4 on the D scale and set the indicator over 8 on the C scale. Now,
leaving the indicator where it is, move the slider till the right-hand
index is under the hairline. Now, leaving the slider where it is, move
the indicator until it is over 6 on the C scale, and read the result,
192, on the D scale. This may be continued indefinitely, and so as many
numbers as desired may be multiplied together.

Example 53: 2.32 * 154 * .0375 * .56 = 7.54

2. Multiplication and division.
Suppose we wish to do the following example:

Example 54: (4 * 15) / 2.5 = 24

First divide 4 by 2.5. Set indicator over 4 on the D scale and move the
slider until 2.5 is under the hair-line. The result of this division,
1.6, appears under the left-hand index of the C scale. We do not need to
write it down, however, but we can immediately move the indicator to 15
on the C scale and read the final result 24 on the D scale under the
hair-line. Let us consider a more complicated problem of the same type:

Example 55: (30/7.5) * (2/4) * (4.5/5) * (1.5/3) = .9

First set indicator over 30 on the D scale and move slider until 7.5 on
the C scale comes under the hairline. The intermediate result, 4,
appears under the right-hand index of the C scale. We do not need to
write it down but merely note it by moving the indicator until the
hair-line is over the right-hand index of the C scale. Now we want to
multiply this result by 2, the next factor in th