So I've been trying to understand a concept in gyroscopes and I hope the guys and girls here can help me with it. I first read it here, the part about mounting 2 gyroscopes with their axes at right angles to each other. It said that the platform will remain totally rigid. I tried to consult a few of my teachers about this but none of them seemed to have an answer why. I've been searching online and the closest I came to finding something that relates is an old US patent No. US3398586. Fig 1 seems to be working around the same concept. So does anyone here know why this happens? Any help would be greatly appreciated. Thank you and have a great day.