Circle diagram constant air-gap induction motor images shown here, where, The circle diagram is drawn using the data obtained from no load and either short circuit or, in case of machines, blocked rotor tests by fitting a half-circle in points O and A. Beyond the error inherent in the constant air-gap assumption, the circle diagram introduces errors due to rotor reactance and rotor resistance variations caused by magnetic saturation and rotor frequency over the range from no-load to operating speed. Steinmetz equivalent circuit Circle diagram First conceived by A. Heyland in 1894 and B.A. Behrend in 1895, the circle diagram is the
A Letter to a Hindu A Letter to a Hindu "A Letter to a Hindu" (also known as "A Letter to a Hindoo") was a letter written by Leo Tolstoy to Tarak Nath Das on 14 December 1908. The letter was written in response to two letters sent by Das, seeking support from the famous Russian author and thinker for India's independence from British colonial rule. The letter was published in the Indian newspaper "Free Hindustan". The letter caused the young Mohandas Gandhi to write to the world-famous Tolstoy to ask for advice and for permission to reprint the "Letter" in Gandhi's own South African