Main control panel for engine #1.  This master control panel was the engineering officer's primary station, and as such, contains instrumentation not only for engine #1 but also repeater gauges for Hornet's other three engines.  The large wheel at the bottom of the frame is one of the two engine throttles, used by the #1 throttleman to set the precise RPMs necessary to generate the speeds ordered by the pilothouse.  Cruising speed was 15 knots, but at flank speed, Hornet was capable of 33 knots.

Low-pressure turbine.  The superheated steam generated by Hornet's eight Babcock & Wilcox boilers could reach pressures of 600 psi and temperatures of 850F, and generated over 150,000 shaft horsepower.  Ambient temperatures in the noisy engine room spaces would routinely reach 120F.

Reduction gearbox.  These reduction gears "step down" the tremendous RPMs generated by the engines into levels usable by the main shafts.  Beneath the catwalk running in front of the red "ahead" sign is one of Hornet's main shafts.  The engine room is located on and around the fifth deck, just below the waterline.