Abstract: An optical micrometer measuring system adapted to gauge minute distances between spaced points on an object under test and to indicate the results in digital terms. The system includes a compound microscope having a stage for supporting the object, the object being illuminated and being focused by an objective onto a real image plane to produce an aerial object image which is viewable in magnified form by an operator through an eyepiece. Associated with the microscope is a projector which creates an illuminated image of a pointer, optical means being provided to superimpose the pointer image over the aerial object image. Operatively coupled to the projector is a micrometer controllable by the operator to translate the pointer image between any two points of interest on the object image. The distance travelled by the pointer image is digitally indicated by an analog-to-digital read-out coupled to the micrometer to provide the desired reading.

Abstract: Fluorescence volume exclusion signals are utilized to evaluate cell volume. Cells are suspended in a medium which is furnished with a fluorescent dye which neither penetrates nor adheres to the cells. Cells are analyzed by an optical flow cytometer, with illumination which causes the dye medium to fluoresce. Passage of a cell through the sensing zone therefore reduces the amount of fluorescent medium being illuminated, and proportionally reduces the fluorescence output signal. Fluorescence volume exclusion pulse height and area are related to cell volume.

Abstract: Specified subclasses of blood cells, such as of lymphocytes, are automatically identified based on utilization of antigenic determinants on the cell surface, their reactivity with antibodies which fluoresce under known circumstances, and utilization of principles of flow cytometry. A blood sample is first incubated with a reagent including antibodies to the lymphocyte subclass to be identified, the antibodies being directly or indirectly made fluorescently responsive to particular light (e. g. argon ion laser). The sample is illuminated, a cell at a time, by such focused coherent light, and forward light scatter, right angle light scatter, and fluorescence are detected and used to identify and enumerate cells of the specified subclass.

Abstract: The disclosure relates to resistance only monitoring and calibration in an electrical cell analyzer. Sample and sheath fluid flows of different salinities are utilized, the sample flow being diameter modulated to produce a selected pattern which is compared to the resistance measured across the flows.

Abstract: A modulation contrast microscope for rendering phase gradients in phase objects visible by virtue of creating light amplitude differences including a source aperture and a modulator having different density or color regions so that when a transparent object with phase gradients is examined the image exhibits viewable contrast effects.

Abstract: A modulation contrast microscope employs a closely wound lamp filament of a rectangular configuration as an illuminating source. The image of the filament is registered on a Fourier plane to which plane a modulator is located which serves to render phase gradients in phase objects visible by functioning to provide light amplitude differences in accordance with modifying the amplitude of the light beam relatively about a given region in both a greater and lesser intensity.

Abstract: A variable background intensity control system employs a modulator plate having different density or transmittance regions located thereon. The modulator contains an area upon which an aperture slit or image is normally registered. By varying the position of this image on the plate, one can achieve a change in background intensity.Other embodiments show the use of additional aperture images registering on other regions of the modulator to achieve background or contrast variations.

Abstract: A random access memory includes a plurality of one-transistor storage cells. A plurality of sense-write conductors are included, each connected to a plurality of storage cells in a row of storage cells. A plurality of regenerative sense amplifiers are each coupled to two sense-write conductors. A one-transistor dummy storage cell is connected to each sense-write conductor. Read-write circuitry is coupled between a data conductor of the memory chip and one of the regenerative sense amplifiers for each of the rows, respectively. The dummy storage cell is selected whenever a storage cell on the opposite side of the regenerative sense amplifier is selected after redistribution of charge initially stored in the selected storage cell onto the sense-write conductor takes place. The sense voltage resulting from the charge redistributed on the opposite sense-write conductor is subsequently amplified by the sense amplifier, and provided in inverted and noninverted form on the two respective sense-write conductors.

Abstract: A curtain rod support assembly is used to support a cylindrical curtain rod in a horizontal plane, wherein a curtain is suspended vertically downward from the curtain rod. A support assembly communicates with each end of the curtain rod. The support assembly broadly consists of a support bracket affixed onto a vertical wall, wherein the end of the curtain rod communicates with the support bracket. An anchoring device communicates with the support bracket as well as ceiling and the vertical wall.