The sign accompanying the spacecraft. It reads
MR-1 Jet Vane
Recovered from Alan B.
Shepard's historic flight on Mercury-Redstone No. 3 "Freedom 7" May 5, 1961. The
jet vane served as the rocket's steering rudder and was mounted to the lower portion of
the rocket in the exhaust plume. It was controlled by radio signals sent
from guiding instruments within the Mission Control Room. This light fixture is from the gantry that serviced
the Mercury-Redstone rocket.
I'm not certain why the sign calls this the "MR-1 jet vane;" the mission was
called "MR-3" (i.e., the third Mercury-Redstone mission), launched on the
"MR-7" booster (the rockets had serial numbers which were confusingly of the
same format as the mission numbers).