Really impressed by the international slide rules museum

[Benjer]

If you're interested in why some of the slide rule scales work as they do, the manual for the K+E Decilon (available for free at the ISRM) has an entire chapter devoted to this subject. I think this manual is one of the best model-specific slide rule manuals ever printed.

Also, some slide rules are "self-documenting" in that they contain, in addition to the typical scale labels such as A, B, C, D, K, etc., the mathematical formula for the scales. For example, if C and D are x, then the square scales A/B are x^2 and cube scale K is x^3. The Faber Castell 2/83N (picture available at the ISRM) is a good example of this.