1. This rule has 22 scales and, as with many Pickett rules, packs a lot of functionality into a small space.
2. One feature on this rule is the presence of a Ln scale for logarithms to the base of e.
3. An example of how space is conserved is the way the log-log scales are placed in parallel with values for numbers greater than one (marked in black) and less than one (marked in red) are placed side by side.