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 inches. A picture of similar dimensions was sold at the Leers sale (201), but this may be the picture formerly in the Hope collection in London (195). Sales: Afterwards in the Van der Hoop collection, No. 50 in the 1876 catalogue. Now in the Rijksmuseum at Amsterdam, Van der Hoop bequest ; No. 1249 in the 1905 catalogue (formerly No. 682)." 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