It is difficult to call this 4-page document a "manual". It is, however, it who describes one of the most important improvements of the slide rule,
and which will be the basis for almost all rules until the end. This brilliant idea heralds the "modern" calculation rule. Mannheim was 20 years old...
He writes on the last line of his instruction: "The cursor will be advantageously used for these calculations."
He writes on the last line of his instruction: "The cursor will be advantageously used for these calculations."