Pedometer with direction readout

作者: Dahlquist Ernst A , Sandberg Eric A

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摘要: An integrating pedometer, to be carried by a person walking, having pendulum pedometer movement, spring-loaded escapement assembly which suddenly reciprocates needle at distance-related periodic intervals, compass positions said as function of the direction travel, sphere is turned sudden reciprocation needle, north-south register wheel and an east-west contacting rotation thereof, readout including dial indicate distance back point origin.

参考文章(1)
Peter A Freeman, Man-carried auto-navigation device ,(1965)