I had the opportunity recently to visit Fort Worden State Park in Pt. Townsend, WA. First, I explored the remains of Battery Kinzie, located on the beach head below the actual fort. This battery, constructed in 1910-11 (IIRC) housed a pair of 12-inch "disappearing" guns.
I have a question regarding an apparatus that is present at this battery. Near the center of the structure, on the upper level, is a room with three wheels stacked one above the other. These wheels (like steel steering wheels), were each connected to a series of rods via chains and sprockets. The rotating motion of the steel rods was transmitted to a spot near each of the two guns, making 90-degree turns via bevel gears. Whatever the rods were connected to at each end no longer exists.
At the fort proper is the Coastal Artillery Museum, located inside one of the barracks buildings (the movie "An Officer and A Gentleman" was filmed at this fort). I highly recommend a visit to the fort and this museum (the small arms room alone is worth the price of admission). The museum has a wonderful 3-D animated movie showing how the 12-inch guns operated. Unfortunately, the animation and photos in the museum do not shed any light on what the three wheels did. Anyone have any ideas?
The Coastal Artillery Museum has a great video on YouTube:
If the link doesn't work, just search for "Coastal Artillery Museum" on the YouTube site and it will come up first.