Abstract: A wheel and tire for an aircraft includes a number of wind receiving ledges radially arranged on side surfaces of the tire for causing the tire to rotate by receiving wind pressure before touch-down of the aircraft in a landing position. According to the invention each ledge is formed on its edge with a bead to obtain rotating speed of the wheel and tire proportional to wind velocity, thereby making it possible to design the wheel and tire whose circumferential velocity at the moment of touch-down is as coincident or substantially coincident with the touch-down speed of the aircraft as possible.

Abstract: A system for collecting solar energy which comprises a thin faceplate made of a large number of optical fibers having respectively a diameter ranging from 0.5 micron to 2.0 micron tied up coherently in a bundle vertically to the plane of the faceplate, and a means for focusing the rays departing from the optical fibers of the faceplate.The faceplate enables to let solar rays entering into the optical fibers from all directions within the numerical aperture of the fibers pass through the fibers to let rays parallel to the principal axis of the faceplate depart from the fibers. Accordingly, the system enables to collect solar energy with a high collecting efficiency with no special means for strictly following the sun.FIG. 4 is a vertical sectional view of a system of this invention, wherein 1 is faceplate, 2 optical fibers composing the faceplate, 3 concave parabolic mirror, 4 convex parabolic mirror, 9 a bundle of optical fibers for transmission.

Abstract: A device for controlling the speed of a vehicle as the latter negotiates a curve includes a U-shaped tube. Terminal elements are secured in an air-tight manner in the legs of the U-shaped tube, and mercury is disposed in the U-shaped tube such as to normally contact the terminal elements when the vehicle is moving in a straight path. The mercury is movable in the U-shaped tube so as to break contact with one of the terminal elements when the vehicle negotiates a curve and subjects the mercury to centrifugal force.

Abstract: A system for collecting solar energy which comprises a thin faceplate made of a large number of optical fibers having respectively a diameter ranging from 0.5 micron to 2.0 micron tied up coherently in a bundle vertically to the plane of the faceplate, and a means for focusing the rays departing from the optical fibers of the faceplate.The faceplate enables to let solar rays entering into the optical fibers from all directions within the numerical aperture of the fibers pass through the fibers to let rays parallel to the principal axis of the faceplate depart from the fibers. Accordingly, the system enables to collect solar energy with a high collecting efficiency with no special means for strictly following the sun.FIG. 4 is a vertical sectional view of a system of this invention, where 1 is faceplate, 2 optical fibers composing the faceplate, 3 concave parabolic mirror, 4 convex parabolic mirror, 9 a bundle of optical fibers for transmission.