The sign near the F-1 engine. It reads
A cluster of five engines like this one provided the power for the first stage
of the Saturn V launch vehicle during all Apollo manned flights to the moon and
the launch of the Skylab orbiting laboratory into Earth orbit.
These engines burned for 2½ minutes, lifting the Saturn V to a
height of about 36 miles and a speed of about 6,000 miles-per-hour. Each F-1
engine developed a thrust of 1,500,000 pounds. Each engine weighs 15,650
pounds and uses propellants of RP-1 kerosene and liquid oxygen.