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 Letter for Tomorrow adds "detecting unpersuasive or implausible claims in Khatami’s statement is not difficult. Among other things, the statement replicated a confusion regarding the notions of "government" () and "the state" (), which in Persian are usually rendered interchangeably. The state as the institutional embodiment of indivisible sovereignty was not headed by Khatami; though notionally the president, he merely acted as the head of an institutionally fragile executive whose authority was ill defined and in practice heavily circumscribed". and "The structural constraints that Khatami faced cannot be underestimated." A Letter for Tomorrow A Letter for Tomorrow (; also translated "Letter for the