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 Young Poet Her essay takes the form of an epistolary letter addressed to Lehmann, and was first published in North America in "The Yale Review" in June 1932, and then by the Hogarth Press as the eighth in their series, "The Hogarth Letters", consisting of 12 titles produced between 1931 and 1933. John Banting illustrated the covers. Following Virginia Woolf's death, Leonard Woolf included the letter in a collection of essays published under the title "The Death of the Moth and other Essays" (1942). Woolf expanded the scope to include the art of poetry, literature, and in particular letter writing. In her