Abstract: A method and a device for measuring an angle required for ascertaining the coordinates of a measuring point comprise two laser beams which are rotatingly emitted from a reference point in opposite directions at the same angular velocity and, at a measuring point, time intervals for receiving the two laser beams are obtained and used for the ascertaining of the measuring point coordinates. The laser device generates two laser beams rotating in opposite angular directions at the same angular velocity. The laser beams are reflected twice in a pentaprism, a compound prism and a rectangular mirror. Errors for mounting the prisms and mirror are thus eliminated resulting in extremely small rotation irregularities. In a method and a device for measuring an angle in 3-dimensional space, laser beams in sectors and a sensor for detecting said laser beam are used; thereby, various angles required for determining coordinates in 3-dimensional space can be measured.

Abstract: A slope paving machine is composed of a wheeled truck, a boom device mounted on and extending from said truck, a pavement finisher which is suspendable from the forward end of said boom device and hingedly connected thereto, and a conveyor mounted on and extending from said truck. The pavement finisher is capable of traveling on a sloped surface in a direction at right angles to a line of slope.