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The Nolan Chart in its traditional form. The Nolan Chart is a political spectrum diagram created by American libertarian activist David Nolan in 1969, charting political views along two axes, representing economic freedom and personal freedom.
Free-body diagram of a U-channel synchronous linear motor. The view is perpendicular to the channel axis. The two coils at centre are mechanically connected, and are energized in "quadrature" (meaning a phase difference of 90° (π/2 radians) between the flux of the magnets and the flux of the coils).