Abstract: A gun sight reticle includes a center horizontal hairline having a central discontinuity and a center sighting area located at the central discontinuity and circumscribed by indicia that encloses the center sighting area, the center sighting area located at a center of the gun sight reticle. The reticle also can include a center vertical hairline that is intersected by the center sighting area such that the center sighting area is located in a discontinuity of the center vertical hairline. The reticle also can include one or more drop-compensation sighting areas disposed below the center sighting area in one or more further discontinuities of the center vertical hairline, the one or more drop-compensation sighting areas being circumscribed by indicia that enclose the sighting area. Preferably, a diameter of the center sighting area is larger than a diameter of the one or more drop-compensation sighting areas.

Abstract: A gun sight reticle includes a plurality of adjustable sighting marks disposed vertically below the central sighting mark. The shooter can adjust the BDC sighting marks so that they more accurately correspond to the correct aiming position for targets that are disposed at various distances from the shooter.

Abstract: A gun sight includes a rangefinder that operates in a continuous-measuring mode as soon as the rangefinder is activated. Because the rangefinder is continuously determining the distance to the target when in the continuous-measuring mode, the user does not have to take any time to press any buttons in order to obtain a distance measurement to a sighted target while aiming at that target.

Abstract: A gun sight includes a rangefinder that operates in a continuous-measuring mode as soon as the rangefinder is activated. Because the rangefinder is continuously determining the distance to the target when in the continuous-measuring mode, the user does not have to take any time to press any buttons in order to obtain a distance measurement to a sighted target while aiming at that target.

Abstract: A gun sight reticle that has orthogonally intersecting center horizontal and center vertical straight hairlines is designed such that at least a portion of the vertical hairline located on a first side of the horizontal hairline is discontinuous such that discontinuities are disposed between straight segments of the vertical hairline. Sighting areas are disposed in at least some of the vertical hairline discontinuities, and the sighting areas are circumscribed by indicia that encloses the sighting area. In one example, the sighting areas are circular, and the indicia for each of the circumscribed sighting areas forms a circle.

Abstract: A head mounted lens support for performing examination and photography of the posterior structures of the eye. The support includes a lateral support to which a pair of adjustable earpieces, and an adjustable nosebridge are attached. Right and left lens positioners are moveably and pivotable attached to the lateral support. The lens positioners each are adjustable by lateral positioners, depth positioners, and angle positioners. The angle positioners swivel from their nominal positions, perpendicular to the lateral support, through an arc of approximately 25 degrees in order to allow full examination of the structures in the posterior chamber of the eye. Right and left lens cradles are attached, respectively, to the ends of the right and left angle positioners. The lens cradles are forms of arc clamps which receive a lens sleeve. The lens sleeve is itself an arc clamp which contains the actual lens.

Abstract: An automated microscope slide marking device 10 for making reference marks on the surface of microscope slides 90. The slides 90 are marked by placing a remote push-button 14 or foot-switch 32 at an ergonomically desirable position for a microscope user. When either the push-button 14, or the foot-switch 32, is engaged by the user, a solenoid coil in an electrical actuator 26 is energized. This actuator 26 controls the movement of a plastic fiber 62 through an ink well 56 and through a thin needle-like tube 58, which is directed toward the surface of the slide 90. Thus, when the actuator 26 is energized, the plastic fiber 62 protrudes from the end of the tube 58 so as to come into contact with the surface of the slide 90 and make a reference mark thereon.