Designed and built by Oscar C. Rosen in 1911, this wireless transmitter is the oldest known surviving example of airborne radio. It was carried aboard a Curtiss aircraft piloted by J.A.D. McCurdy. The airplane could not carry the additional weight of Rosen, so the telegraph key was attached to the control wheel, and McCurdy sent the message.
This object is on display in Pre-1920 Aviation at the Steven F. Udvar-Hazy Center in Chantilly, VA.