From the site:
Toy makers have long experimented with ways that toys could simulate human and other real-life action. Key-wound clockwork mechanisms, mass produced by the late 1800s, revolutionized the toy world. Different mechanisms could motivate dolls, engines, cars, boats, and other novelty toys, producing amazing and eccentric variations of speed and direction. Although many of these were ostensibly designed as children's playthings, they were equally appealing to adults.
Visit The Henry Ford Museum's Toys and Games section online
Also check out the online exhibit related to toys. (The link is at the very bottom labeled "enter".)