| Scale
| Description
|
| A
| 2 cycles, 1-100 for squares and square roots; typically on upper body.
|
| B
| 2 cycles, 1-100 for squares and square roots; typically on slide.
|
| C
| 1 cycle, 1-10 for multiplication and division; typically on slide.
|
| CF
| 1 cycle, 1-10, folded at pi, for multiplication and division, to help avoid the need to run the slide more than halfway out of the body; typically on slide.
|
| CI
| 1 cycle, reversed, 10-1 for division and reciprocals; typically on slide.
|
| CIF
| 1 cycle, reversed, 10-1, folded at 1/pi, for division and reciprocals, to help avoid the need to run the slide more than halfway out of the body; typically on slide.
|
| D
| 1 cycle, 1-10 for multiplication and division; typically on lower body.
|
| DF
| 1 cycle, 1-10, folded at pi, for multiplication and division, to help avoid the need to run the slide more than halfway out of the body; typically on body.
|
| DI
| 1 cycle, reversed, 10-1 for division and reciprocals; typically on lower body.
|
| K
| 3 cycles, 1-1000 for cubes and cube roots; typically on body.
|
| L
| for taking the logarithm of a number usually on the C or D scales; one cycle, 0-1 in even increments. On a 10-inch rule, this might be used for lineal measurement, but on the Pickett 10-inch rules, the distance from 0 to 0.1 is 63/64 inch. A missed opportunity! (Never fear, in metric the distance from 0 to 0.1 is 2.5 cm...)
|
| LL
| used for taking arbitrary exponents and natural logarithms. LL means Log-Log, and as log scales reduce multiplication to addition, the log-log reduces exponentiation to addition.
|
| Ln
| for taking the natural logarithm of a number usually on the C or D scales.
|
| N
| used for taking arbitrary exponents and common logarithms. A common (base 10) log version of the LL scale.
|
| R
| usually two scales, for taking square roots with higher precision than the A and B scales allow.
|
| S
| for taking sines and cosines, usually in the range of 6-84 degrees; typically on slide.
|
| Sh
| for taking hyperbolic sines.
|
| SI
| inverse scale for taking sines and cosines, usually in the range of 6-84 degrees; typically on slide.
|
| ST
| for taking sines and tangents of small angles, usually in the range of 0.573-5.74 degrees; typically on slide. A left continuation of the S and T scales.
|
| T
| for taking tangents, usually in the range of 5.74-90 degrees; typically on slide.
|
| Th
| for taking hyperbolic tangents.
|
| TI
| an inverse scale for taking tangents, usually in the range of 5.74-90 degrees; typically on slide.
|
