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
A Perfect Circle of relevance and quality in contemporary rock music. Online music magazine musicOMH asserted the band had "literally defined alternative rock as we know it." Current members Touring members Former members A Perfect Circle A Perfect Circle is an American rock supergroup formed in 1999 by guitarist Billy Howerdel and Tool vocalist Maynard James Keenan. A Perfect Circle has released four studio albums, the first three during the early 2000s: "Mer de Noms", their debut album in 2000, and followed up by "Thirteenth Step" in 2003; then in 2004, "Emotive"—an album of radically re-worked cover songs titles. Shortly after "Emotive"s release,