Abstract: A mechanism for carrying a calibration standard and receiving a cuvette containing a blood sample to be tested is disclosed. The mechanism permits convenient shifting to either the test position or calibration position.

Abstract: A tray for holding a biological specimen and a submersible container for freeze-drying the specimen are disclosed. A heating element to melt a synthetic resin for embedding the specimen is also disclosed.

Abstract: An illumination system for bright field/dark field microscopy has a swinging deflector which is normally positioned on the optical axis when bright field microscopy is used and which is swung off the optical axis when dark field microscopy is used. When the deflector is swung off the optical axis an alternate illumination axis is utilized to provide a reduced portion of the observation axis having coaxial counterflowing light passing there along.

Abstract: A seven-member microscope objective having a numerical aperture of 0.55 providing a magnification of substantially 40X in combination with a telescope objective as described in U.S. Pat. No. 3,355,234 is disclosed.

Abstract: Columnar lens elements of a crossed multi-ocular array are each formed of a rectangular preform of core glass containing a modifying oxide which is clad on each of two of its opposite sides with a glass having an affinity to ions of the modifying oxide and on remaining sides with a substantially non-reactive glass, all cladding glasses being preferentially soluble relative to the core glass. The clad preform is heated and drawn to the cross-sectional size desired of the aforesaid lens elements and cut transaxially into component lengths equal to or greater than desired for the array. A multiplicity of the cut components are tightly juxtapositioned, heated for diffusion of oxide ions into the first mentioned cladding glasses, cooled, annealed and leached free of all claddings for final crossed assembly.

Abstract: A coating composition which results from hydrolyzing 35 to 70 weight percent tetraethyl orthosilicate and 60 to 20 weight percent of certain silane is useful for providing abrasion resisting coatings for plastics after curing. Optionally, up to 20 weight percent of a silane having a reactive polar site or, in the alternative, a small percentage of a surfactant may be used to provide a dyeable coated article.

Abstract: A gasket for a lens casting cell designed to accommodate for casting material shrinkage during curing in the cell.

Abstract: Apparatus for supporting a lens during heat treatment that has a heat-sinking material in contact with one side of a heat-conductive cover and the other side of the heat-conductive cover in contact with a portion of a lens being treated to produce photochromic behavior is disclosed. The portion of the lens in contact with the heat-conductive cover exhibits less photochromic activity than the portion of the lens which is not in contact with the heat-conductive cover.

Abstract: Interference filters having a vapor deposited layer of a silicon oxide adjacent to a vapor deposited layer of silver have adhesion between these layers improved by a very thin intermediate coating of chromium, nickel or an alloy containing about 90% chromium and nickel. Plastic articles having infrared reflecting interference filters with improved adhesion between layers, such as lenses and welding faceplates, are also disclosed.

Abstract: A joint having a plurality of spherical elements cemented to one member and the other member having adjustable sockets which cooperate with the spherical elements to permit rotation about a single axis. The joint is particularly useful in microtomes and ultramicrotomes.

Abstract: A device for verifying instrument readings of transient force of a moving fluid column including a paddle depending from a taut wire torsion bar. The unit is adaptable to instruments utilizing fluid pulses in testing objects for resistance or vulnerability to fluid stream pressure, e.g. ophthalmic tonometers. With disposition of the paddle in an instrument fluid path and a known torsional force applied to the supporting wire, the force required of a fluid column to displace the paddle may be established for verification of instrument readings and/or indication of defective instruments.

Abstract: A positive and negative lens of equal power can provide the means to scan small objects being observed through a microscope if one of the lenses can be selectively decentered. The arrangement is particularly useful for microscopes having photometers that are used to analyze very small specimens, such as chromosomes, by scanning.

Abstract: A holder for a lens-marking pen attachable to the pen oppositely of its working end and having a rest in the form of a spring arm adapted to extend along a side of the pen to a bifurcated termination straddling the pen's marking tip and resiliently biasing the tip away therefrom. In its function as a pen rest, the bifurcation of the spring is placed against a lens or other surface to be marked for steadying the pen which may then be depressed to bring its marking tip into contact with the surface between legs of the bifurcation.

Abstract: A refractor optical system having a new series of spherical and cylinder lenses substantially eliminates the irregular occurrence of additive errors when lenses spaced from the reference plane are used or more than two lenses are combined and permits correction for the significant additive errors by non-additive lens selection.

Abstract: Photochromic compounds of the formula ##STR1## wherein one of R.sub.1 and R.sub.2 is halogen or lower alkoxy, and the other is hydrogen, and R.sub.3 and R.sub.4 are hydrogen, lower alkyl, lower alkoxy, or halogen and their use in lenses are disclosed.

Abstract: A replaceable blade cartridge shaving system having an elongate handle with a coupling head formed at its terminal end. The coupling head is arrayed transversely of the handle axis and has two elongate substantially parallel coupling flanges formed thereon. The flanges extend transversely of the head and perpendicular thereto. Located between the flanges and extending a predetermined distance from the terminal end of the handle above a plane containing the flanges is a protuberance member. The cartridge has complementary grooves formed along its base for slidable engagement with the handle flanges and a recess is formed between the grooves having sufficient clearance as to allow the protuberance member to fit therein. Attempted use of the handle with other than a cartridge having such recess produces interference between the handle and the cartridge, thereby preventing slidable engagement therebetween.