Fecha de publicación: 29/05/1919 Fuente: WIPO "pollen" 127,032. Pollen, A. H., and Landstad, H. F. March 21, 1917. Sights and methods of sighting.-Consists of a linkage by means of which the course to be steered by the pilot of an aircraft so that he may pass over a given object on the ground is automatically indicated to him so long as an observer keeps a sight on the object. The speed through the air, and the speed and direction of the wind, are set up on a linkage, one member of which carries the sight to be kept directed on the object. In the construction shown in Fig. 1 the linkage is mounted upon a magnetic compass. A rotatable ring 19 carries an arm 3 for setting the wind, speed, and direction, a block 6 being screw-traversed to a distance from the compass centre proportional to the speed of the wind, and the ring 19 rotated by means of a handle 20 so that the arm 3 is in the wind direction. The speed through the air is set up by a traversing block on an arm 2 carried by a ring 24 rotatable by means of a handle 23. A sighting-bar 5 is carried by pivots X and Y on the adjustable blocks of the arms 2 and 3 and is kept directed on the object, the arm 2 being suitably rotated while the arm 3 is maintained over the compass bearing of the wind. The movements of the ring 24 carrying the, arm upon which the speed through the air is set up are communicated by suitable gearing to an arm or lubber-mark rotating round a similar compass in front of the pilot. In one construction the movements are communicated to a similar ring rotatable round the outside of a stationary frame in which the outer gimbal ring of a compass is rotatably mounted, the gimbal ring being connected by a clamp to the outer rotatable ring, and the course to be steered being indicated by an arrow over the card.