Portal de Periódicos da CAPES

The vehicular odograph

1947; Volume: 52; Issue: 1 Linguagem: Inglês

10.1029/te052i001p00039

2379-5697

A. G. McNish, Bryant Tuckerman,

Electric Motor Design and Analysis

A description is given of the vehicular odograph, a device for automatically plotting the course of a vehicle in which the odograph is mounted. The odograph derives information on direction from a magnetic compass which is read by a photoelectric system and information on distance from a shaft geared to the speedometer‐cable. Errors in maps obtained with the device amount to two or three per cent of the total distance traveled under ordinary rough conditions of operation, but with the exercise of certain precautions these errors can be greatly reduced. Detailed discussion on the operation and compensation of a magnetic compass in a vehicle, with particular emphasis on problems of sub‐permanent magnetization is included, together with a theoretical analysis of the integrating process employed which involves averaging of discrete intervals.