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
What a Friend We Have in Jesus What a Friend We Have in Jesus "What a Friend We Have in Jesus" is a Christian hymn originally written by preacher Joseph M. Scriven as a poem in 1855 to comfort his mother who was living in Ireland while he was in Canada. Scriven originally published the poem anonymously, and only received full credit for it in the 1880s. The tune to the hymn was composed by Charles Crozat Converse in 1868. William Bolcom composed a setting of the hymn. The hymn also has many versions with different lyrics in multiple languages. The "Handbook to the Lutheran Hymnal" notes,