Charles N. Pickworth’s The Slide Rule: A Practical Manual was the standard British text on the instrument for decades, passing through edition after edition in the hands of working engineers. It covers the theory of the logarithmic scales, every standard operation, and the specialised rules of the trades — electrical, mechanical, commercial — each with worked examples.
If one book represents the slide rule at the height of its reign, it is this one. Download the free EPUB for the complete education of the pre-electronic engineer.