Fourier transform is important means in the synthesis and analysis of automatic control systems but it is tedious work to transform t-function into ω-function. The author has made a slide rule, by which t-function is easily transformed into ω-function, or conversely co-function into t-function. Synthesis using this slide rule is stated.
In Appendix the author shows the slide rule, which was invented by Keisuke Izawa and the author, conveniently used in the addition on Bode Diagram.
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