Abstract: A stereomicroscope for comparing photographs is disclosed. The microscope includes a pair of complementary occluders with one occluder positioned in an intermediate image plane of each side of the stereo optical system, which also includes a conventional image rotator and zoom system to permit independent adjustment of the orientation and size of each image. The complementary occluders accentuate small differences between nearly identical photographs by providing a border at which an object present in only one photograph will appear or disappear as the two photographs are simultaneously scanned.

Abstract: A stereo vision optical instrument having eyepieces which are rotatably mounted to the instrument by way of pivot plates includes apparatus coupled between the pivot plates to prevent binding of the eyepieces as they are rotated.

Abstract: An optical alignment system using at least one CCD array for positioning an instrument in a chosen relationship to an object is disclosed. Means for "electronically" aligning the optical components and providing a macro view of the object on a CRT without additional illumination are also disclosed. Alignment may be achieved manually, if the operator observes the position of symbols on a CRT that move in response to movement of the instrument by the operator using a joystick, or automatically using information provided by the array.

Abstract: A mechanical indicator for indicating the intensity of an illuminator is described for use in an optical instrument. The indicator includes a cover plate having a plurality of apertures and an opaque slide plate mounted behind the cover. The opaque slide plate is connected to the apparatus controlling the lamp intensity and moves across the apertures as the lamp intensity is changed. A source of illumination is positioned with respect to the opaque slide plate so as to emit light through the apertures not covered by the plate.

Abstract: A cover member is set forth which protects the rotatable turret and objectives of an inverted microscope from exposure to corrosive or otherwise potentially harmful substances.

Abstract: A zoom lens system for optical instruments incorporates a crank and linkage mechanism which is adjustable to alter the conjugate length between at least a pair of zoom lens assemblies of the zoom lens system.

Abstract: A microscope body is adapted to compensate for the deliberately introduced 0.6 percent lateral color of an infinity corrected microscope objective. This compensation of the lateral color by the microscope body is done without introducing objectionable axial color aberration. The microscope body is typically a trinocular body which provides an image to binocular eyepieces for observation by a user or alternatively to both the eyepieces and to a focal plane of a camera.

Abstract: A method and apparatus for non-invasive in vivo inspection of ocular tissue wherein a laser provides a low power, coherent and uniform output beam of light which is guided through the optical system of a modified slit lamp biomicroscope to the eye of a patient for scattering by protein molecules in the ocular tissue of the patient, and scattered laser light in the ocular tissue is viewed through the slit lamp to visually align a pick up associated with the slit lamp optical system to a desired location in the ocular tissue. A measurement is performed by receiving laser light scattered from the ocular tissue and converting the scattered light into an electrical signal, and the electrical signal is analyzed by sorting it into components each characterized by an intensity and a fluctuation rate and each component associated with a protein group in the ocular tissue.

Abstract: In a clamping mechanism for a blade of a microtome, in which the blade is clampable in a cutting blade mounting, the blade is supported on its front side and on its rear side in proximity with the cutting edge in the cutting region of the blade.

Abstract: An interference filter for the removal of power line interference from amplifying systems, such as electrocardiographs, which includes a band-rejection filter tuned to reject the power line frequency interference, a differential amplifier to which the signal being amplified and the output of the notch filter are applied to produce an output consisting of only the interference signal. The interference signal is fed to and stored in a memory which is constantly updated and the output of the memory is then summed with the original signal. Since the phase of the output of the memory is reversed from the interference in the original signal, only the original signal will result. An electronic switch is connected between the output of the differential amplifier and the memory and is operated by a velocity detector connected with the output of the band-rejection filter.

Abstract: Electrocardiographic apparatus including a novel and improved recording paper feed and lead switching arrangement which include a platen having a platen roller, both movable from an open position for installing a supply of recording paper to a position wherein the platen roller with recording paper fed about the surface thereof is moved to an operating position with the platen roller in recording engagement with a recording pen. A paper drive roller is positioned in adjoining relationship to the platen roller and engages the platen roller with the paper thereon when in the operating position. The recording paper is provided with spaced cue marks and transverse perforations between successive cue marks and the apparatus includes a cue detector and associated electric circuitry for detecting said cues so that heart muscle signals from successive groups of patient leads will be recorded on successive segments of the paper defined by the perforations.