Fecha de publicación: 08/01/1920 Fuente: WIPO "pollen" 137,257. Pollen, A. H., and Landstad, H. F. Aug. 12, 1919. Aeronautical compasses; bearings and courses, indicating and determining; navigational calculation apparatus. - Relates to navigating compasses for aircraft of the type described in Specification 127,032, and comprises a compact arrangement of wind, air, and ground speed linkages and of the corresponding indicators. The air-speed vector is set up from the drum D by means of a pinion D and rack D on a slide F moving along the fore- and-aft line of the aircraft, the horizontal projection of the distance BF representing this speed The pivot B is the centre of rotation for the compass, and the sleeve F is attached to a table W carrying guides W within which moves the block W positioning the pin D on the slide D. By means of the handle C' the compass bowl B is then turned to set a pointer on it in the direction of the wind. At the same time bv gearing, part of which is shown by W, W, W, Fig. 3, the table W is caused to turn to the same extent so that the guides W are parallel to the wind's direction. Then, from the handle W, Fig. 4, through bevelgearing W, W, W, W the screw W" is actuated to set the pin P so that PF represents the wind-speed vector. BP then represents the ground speed and the sights parallel to the slide D show the drift. A measure of the ground speed is given by means of a wire or band G, Fig. 4, attached to a pulley G on a pinion G gearing into internal teeth G on a graduated drum concentric with the compass bowl, the other end of the wire being attached to the support for the pin D. Positioning of the pin P sets the drum against a fixed pointer. An arm extending from the side of the casing forms a sight-hole well above and central to the compass to facilitate reading. A movable lubber line may be provided.6>6>2>3>6>5>4>6>2>2>6>6>18>19>21>22>2>15>5>7>8>10>4>6>16>15>5>2>2>2>2>3>2>