A Worm and sector steering device, cross-sectioned. It was developed by Panhard-Levassor. The spindle of the steering wheel carries a worm gear at the base of the head.
Homans, James E. A Practical Illustrated Treatise on Automobiles (New York, NY: Theo. Audel & Company, 1907) 60
Courtesy the private collection of Roy Winkelman