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* [[Trigonometry]] and [[Trigonometric functions]] — Rhind Mathematical Papyrus problem number 56. The Egyptians, used a pri .... ''[https://books.google.com/books?id=vf8tAAAAIAAJ&dq=ptolemy%27s+intense+diatonic+scale&pg=PA961 The Encyclopædia Britannica]'', Vol.28, p. 961. The Encyclop ...

....] . A directional valve is a key element of the control system. The valve functions as a camshaft distributing air to particular engine chambers. The construct ...amedit|synd|2316}}</ref> who firstly created it for testing of circulatory functions. ...