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NATIONAL AERONAUTICS AND SPACE ADMINISTRATION For sale by the Office of Technical Services , Department of Commerce , Washington , D.C.\u0026nbsp;...","page_url":"https://books.google.com.sg/books?id=I-sQAQAAIAAJ\u0026pg=PR1\u0026dq=%22Square+wave%22+-wikipedia"},{"page_id":"PR2","page_number":"ii","snippet_text":"","page_url":"https://books.google.com.sg/books?id=I-sQAQAAIAAJ\u0026pg=PR2\u0026dq=%22Square+wave%22+-wikipedia"},{"page_id":"PR3","page_number":"iii","snippet_text":"","page_url":"https://books.google.com.sg/books?id=I-sQAQAAIAAJ\u0026pg=PR3\u0026dq=%22Square+wave%22+-wikipedia"},{"page_id":"PR4","page_number":"iv","snippet_text":"","page_url":"https://books.google.com.sg/books?id=I-sQAQAAIAAJ\u0026pg=PR4\u0026dq=%22Square+wave%22+-wikipedia"},{"page_id":"PR5","page_number":"v","snippet_text":"... \u003cb\u003esquare wave\u003c/b\u003e function frequency of I ( t ) period of I ( t ) frequency of output square waves under the free - run condition period of the output square waves under the free - run condition f ( x ) output of the x relay section f ( y )\u0026nbsp;...","page_url":"https://books.google.com.sg/books?id=I-sQAQAAIAAJ\u0026pg=PR5\u0026dq=%22Square+wave%22+-wikipedia"},{"page_id":"PA1","page_number":"1","snippet_text":"... \u003cb\u003esquare wave\u003c/b\u003e input of constant amplitude at the bending mode fre- quency . 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