Apparatus for improving the accuracy of a friction wheel distance measuring device

摘要

A flat strip of metal forms the surface on which the friction wheel of a distance measuring device travels. The angle of the strip relative to the path of movement of the friction wheel is made adjustable. By making the perimeter surface of the friction wheel with striations extending along a skewed angle relative to the axis of rotation and forming the imprint of the friction wheel along the strip by rolling the wheel along the length of the strip. Subsequent slight changes in the angle of the strip relative to the path of movement of the wheel; causes the reading of the distance measuring device to change slightly for a given amount of movement of the device along its path to travel.