Man Demonstrates Hand Pedal Device

A carte de visite by an anonymous photographer pictures a man who sits on the floor and demonstrates a machine that features hand-operated pedals that turn a gear. Footrests extend from a cast iron base, and a harness of sorts is attached to curved metal strips to which the footrests are attached. The purpose of this device is not known.

This image is new to my collection, and available on PinterestTumblr, and Flickr.
Man Demonstrates Hand Pedal Device