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Diagram of the force running wheel (FRW). Foot-rung forces are measured on an isolated rung instrument via strain gages placed on orthogonally oriented spring blades in an L-bracket configuration for force sensing in normal and tangential directions. Strain-gage wiring is passed through an opening in the hollow shaft and connected to a slip ring at the end of the axle (not shown) to allow for strain-gage excitation and data collection. Values are in inches.
