Abstract: Apparatus for detecting the presence and/or determining the intensity and/or determining the wavelength and/or determining the threshold direction of coherent radiation in the presence of incoherent ambient radiation.A preferred form of apparatus includes a Fabry-Perot etalon having three regions of different thickness such that the optical phase difference between the second region and third adjacent region is less than .pi.

Abstract: An automatic sampling apparatus particularly adapted for flameless atomic absorption spectrometers has a turntable carrying a ring of sample containers. The turntable is rotatably mounted on a base plate which in turn is mounted for limited pivotal movement on a support. A rinse station for a sample probe is provided on the base plate adjacent the periphery of the turntable. A sample probe in the form of an elongated tube angled at one end to form a pipette-like tip is mounted for swinging movement about a transverse axis and concomitant rotation about its longitudinal axis so that, at both limits of movement about the transverse axis, the probe tip is directed generally downwardly.

Abstract: The invention relates to a graphite tube assembly for use in an atomic absorption spectrometer for measuring the flameless absorption of samples when passing a beam of radiation therethrough, which includes a graphite tube and an inner body disposed in the interior of the graphite tube, but externally of the beam of radiation when passing through the tube, said inner body extending only over a portion of the length of the graphite tube.

Abstract: A cooling vent within a thermal system, which has heat otherwise supplied to regulate the temperature thereof, is controlled to open and close incrementally so that temperature control near room ambient is facilitated.

Abstract: In an optical system having a mirror system for reflecting light from a field of interest to form a desired image on sensitive material disposed in a focal plane, the improvement characterized by the provision of a centrally located obscuration disposed adjacent the front of a mirror for intercepting light reflected from the sensitive material toward the mirror to prevent reflection from the mirror of said light reflected from the sensitive material from reilluminating the sensitive material, to thereby improve the contrast the desired image.

Abstract: An improved slide holder for use with a clinical spinner comprises a support having a channel defined in the top thereof transverse to the vertical axis of rotation of the support. Rapid rotation of the support with a slide positioned over the channel effects a partial vacuum in the channel which tends to hold the slide tightly against the support. Mechanical stops and spring retainers may also be included to insure retention of the slide on the support. The design of the slide holder minimizes the formation of an aerosol during spinning. A disposable spin-off interception system cooperates with the slide holder's operating characteristics to effectively eliminate aerosol formed.

Abstract: A small diameter transparent visible fluid flow indicator suitable for mounting behind an opening in an instrument panel contains a six-bladed paddle wheel pivoted for rotation by the flow of fluid passing through orifices in the indicator housing. Each of the six blades of the wheel contains a small magnet oppositely polarized from the magnets in the adjacent blades to create alternate magnetic fields that pass through a pickup coil embedded in the housing. The resulting coil voltage is amplified and rectified to control a relay switch. Thus, the liquid flow indicator provides both a visible indication of fluid flow and also controls a switching circuit that may be used as an alarm if the fluid flow stops or varies from some predetermined value.