Essentially, a gyroscope is a top combined with a pair of gimbals. On this spacecraft, a set of gimbals was used on an inertial measurement unit (IMU). Such a CMG includes two gimbals per rotor. All three gimbals can still rotate freely about their respective axes of suspension. These are rotors spun at constant speed, mounted on gimbals to provide attitude control. Gimbals and motors are replaced by arrays of metamaterials in a planar configuration. In the early modern period, dry compasses were suspended in gimbals. Another way to replace gimbals is to use fluid bearings or a flotation chamber. This stable platform is mounted in a system of platform gimbals. The platform gimbals can be rotated by the visitor with a remote control box. The S-IV stage was powered by six LOX / LH2-fueled RL10 engines, mounted on gimbals. Tani performed a spacewalk to wrap thermal blankets around the ISS Solar Array Gimbals. Modern practice is to avoid the use of gimbals entirely. Beam modulation is being refined, as its software, and gimbals. These features were made possible by the use of these rigs and gimbals.