Circle diagram Circle diagram First conceived by A. Heyland in 1894 and B.A. Behrend in 1895, the circle diagram is the graphical representation of the performance of the electrical machine drawn in terms of the locus of the machine's input voltage and current. The circle diagram can be drawn for alternators, synchronous motors, transformers, induction motors. The Heyland diagram is an approximate representation of circle diagram applied to induction motors, which assumes that stator input voltage, rotor resistance and rotor reactance are constant and stator resistance and core loss are zero. Another common circle diagram form is as described in the two
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