Abstract: A coordinate measuring apparatus comprises a frame substantially formed by a rectangular prismatic body and an indexing rotary table which is connected to the front side portion of the prismatic body to form an L-shaped structure. Above the prismatic body, a cantilever arm projects over the rotary table. The cantilever arm is movable at its level, perpendicularly to its longitudinal axis and carries a tail spindle which is equipped with a measuring head. The clear construction of the apparatus which is easy to survey and with its overhead guideways, is an ideal arrangement for applying a linear measuring system.