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
Grave Circle A, Mycenae Grave Circle A, Mycenae Grave Circle A is a 16th-century BC royal cemetery situated to the south of the Lion Gate, the main entrance of the Bronze Age citadel of Mycenae in southern Greece. This burial complex was initially constructed outside the fortification walls of Mycenae, but was ultimately enclosed in the acropolis when the fortifications were extended during the 13th century BC. Grave Circle A and Grave Circle B, the latter found outside the walls of Mycenae, represent one of the major characteristics of the early phase of the Mycenaean civilization. The circle has a diameter of and contains