Abstract: A device for mounting a load and orienting the load in two orthogonal senses includes two facing elements. One element has three spheres disposed in first, second and third seats. A line joining the first and second seats is orthogonal to a line joining the first and third seats. The sphere in the first seat contacts a conical contact surface on the other element. The sphere in the second seat contacts a planar contact surface on the other element. The sphere in the third seat contacts a vee-groove contact surface on the other element. Displacement means, in the form of conical surfaces on threaded rods, associated with the second and third seats serve to displace the spheres outwardly of the second and third seats to cause tipping and tilting of the contact surface bearing element relative to the one element.