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 Lady Writing a Letter for exhibition at the Pasadena, California museum from November 7, 2008 through February 9, 2009. In Blue Balliett's children's book, "Chasing Vermeer", "A Lady Writing" is stolen on its way from the National Gallery of Art to Chicago, causing the main conflict of the story. A Lady Writing a Letter A Lady Writing a Letter (also known as A Lady Writing; ) is an oil painting attributed to 17th century Dutch painter Johannes Vermeer. It is believed to have been completed around 1665. The Lady is seen to be writing a letter and has been interrupted, so gently turns her