Abstract: A sighting apparatus comprising an optical system which includes a laser oscillator and an automatic correction mechanism mounted on a rotational table, wherein the laser beams from the oscillator are emitted in any horizontal direction by remote control. A circular air bubble tube is provide on the table such that the position of an air bubble in the tube is sensed by a photosensor to recognize the tilt of the table. When the tilt of the table exceeds an effective operation range of the automatic correction mechanism, an interrupter circuit is operated to interrupt a power source circuit for the laser oscillator.

Abstract: A sighting apparatus in which a laser oscillator and an optical system are provided on a rotational table and in which the laser beam is emitted in any horizontal direction by remote control. A movement conversion mechanism which converts a rotational movement to a linear movement, and a drive unit which comprises a motor operated by remote control and a reduction gear mechanism which transmits the rotation of the motor to the movement conversion mechanism are provided on the table. The movement conversion mechanism is connected to a movable mirror cylinder which holds a focusing lens constituting a part of the optical system to move the focusing lens by remote control.