Abstract: A magnetic compass comprises: a gimbal mounted direct read card supported on a bearing in the equatorial plane of the compass in a compass bowl; and a housing having a base to which the compass bowl and corrector magnets are mounted; the corrector magnets being positioned above the base beside the bowl for access without moving the compass; means for supporting the corrector magnets located on three axes, one axis parallel to the lubber line and the equatorial plane of the compass in a horizontal orientation of the housing, a second normal to the lubber line and parallel to the equatorial plane and a third normal to the equatorial plane in a horizontal orientation of the housing and parallel to the lubber line and the equatorial plane in a vertical orientation of the housing; said corrector magnets mounted on two of said axes, said second axis and the one of said first and third axes parallel to said lubber line in the horizontal or vertical orientation selected for mounting said compass; the compass card ass

Abstract: A small, light magnetic compass, in which the magnetic moment of the compass card is large relative to its weight, is adjustably mounted upon a member firmly coupled to the human head so that accurate compass bearings may be obtained, or a vessel steered, through an optical system presenting a magnified image of the compass card to the eye of the wearer.

Abstract: A spray device for applying liquid preparations to vegetation comprises a roller-shaped vegetation presser element of adjustable length rotatably carried between the lower ends of two parallel inclined support arms which are adjustable toward and away from each other and which are hinged at their upper ends for swinging movement in a vertical plane, and a spray nozzle supported on at least one of the arms for vertical and horizontal adjustment and located so as to direct a spray toward the area which has just been traversed by the presser element.

Abstract: Spatially adaptable support means for orienting the compass card immersed in damping fluid within a spherical housing of a magnetic compass to a horizontal plane during installation in any given mounting surface, comprising a movable compass card support unit and means for adjustably selectively positioning the support unit relative to the mounting plane and the sphere thereby positioning the card in its horizontal plane.