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
Young woman with a letter and a messenger in an interior Young woman with a letter and a messenger in an interior Young woman with a letter and a messenger in an interior (1670) is an oil on canvas painting by the Dutch painter Pieter de Hooch, it is an example of Dutch Golden Age painting and is part of the collection of the Rijksmuseum. This painting by Hooch was documented by Hofstede de Groot in 1908, who wrote; "173. YOUNG LADY IN A VESTIBULE RECEIVING A LETTER. Sm. 51, Suppl. 22 ; de G. 7. A lady, wearing a light blue jacket and a red skirt, sits in the farther