The FR 1 (France 1) spacecraft was a small spacecraft carrying two experiments. One was designed to observe VLF signals from earth-based transmitters, and the other was an electron density probe measuring electron concentration at the satellite. December 6, 1965 at 21:05 UTC · Launch Successful Scout X-4 — National Center of Space Research, to Low Earth Orbit Space Launch Complex 5, Vandenberg SFB, CA, USA The world's 505th orbital launch attempt, and 112th of 1965. Data: Launch Library 2, The Space Devs. Image by U.S. Air Force (Department of Defense Image Use Policy) via The Space Devs.