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
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