Before the days of MEMS gyroscopes and advanced electronics, engineers still had a need for stabilization in the systems they were controlling. One example of this was stabilizing torpedoes as they were fired towards enemy ships.

I was able to find this excellent specimen on eBay:

MK 12-3 Gyro


From all appearances, it looks like the gyro is meant to be spun up via a planetary gearbox with the gyro in the center.