Balance Boards

The drawing is from the 1958 U.S. patent for a rocker-roller balance board designed by Frederic George Ludwig of Woodbridge, Connecticut. In the online database of the U.S. Patent and Trademark Office, the vers More

The drawing is from the 1958 U.S. patent for a rocker-roller balance board designed by Frederic George Ludwig of Woodbridge, Connecticut. In the online database of the U.S. Patent and Trademark Office, the vers More

The drawing is from the 1958 U.S. patent for a rocker-roller balance board designed by Frederic George Ludwig of Woodbridge, Connecticut. In the online database of the U.S. Patent and Trademark Office, the vers More

This is one of the patent drawings for the first design of a wobble board known to have been patented. The inventor was Bernard L. Coplin of Carlsbad, New Mexico. The 1957 U.S. patent for this device was appl More

These are two of the patent drawings for the first design of a wobble board known to have been patented. The inventor was Bernard L. Coplin of Carlsbad, New Mexico. The 1957 U.S. patent for this device was ap More

These are two of the three patent drawings for a device made by the U.S. government's National Aeronautics and Space Administration to train its astronauts for spacewalks. The inventor was Harold I. Johnson o More

This is one of the three patent drawings for a device made by the U.S. government's National Aeronautics and Space Administration to train its astronauts for spacewalks. The inventor was Harold I. Johnson of More

"Pirates of the Sky" aerialists act, performing at the 2008 New York State Fair. Photos at <www.Flickr.com> that are a frontal view of this juggler during this event show the board to be about 27 inches long an More