1. As its model name suggests this is a learner's rule.
2. Although simple the rule does have a good range of trig scales, two tan scales and an
ST scale.
3. As with other earlier Faber Castell rules, the table at the back gives positions of C
and D scales for well known constants. However, whereas the earlier rules only gave the
positions of the scales, this rule also gives the numerical values.
Front view
Detail - front left
Detail - front right
