Abstract: A light scattering oil-in-water detector and method. Scattered light is measured at a plurality of scattering angles, one angle being chosen such that the light scattered by the oil is substantially zero. This overcomes interference arising from suspended solids, e.g., rust.

Abstract: Apparatus for illuminating a gas or gas mixture and filtering the output thereof alternately with two filters. One filter has a passband at an absorption band of a gas to be detected. The other filter has a passband outside the absorption band.

Abstract: A method of making a non-corrosive plastic bellows by ultrasonic welding inner and outer flanges of discs with cylindrical and half-cylindrical horns, respectively. The half-cylindrical horn and a fixture used therewith have lips to fit on opposite sides of a pair of contacting outer flanges and in between two pairs of flanges. The inner flanges are thus welded first.

Abstract: To enable printing to be done in lines parallel to the edge of a record web as well as in lines perpendicular to the edge, a type-wheel is provided which has its slugs disposed at an angle, preferably 45.degree., to the radii through the centers of the slugs. Two hammer positions are also provided, one being positioned so as to produce the kind of lines first mentioned, and the other positioned to produce the kind of lines second mentioned.

Abstract: A differential pressure unit having overrange valves loosely mounted on a valve stem connected between the ends of a respective pair of movable bellows ends. A pair of spiral range springs bias both valves toward open positions. The valves include annular elastomers bonded to the edges of the apertured discs. The apertures in the discs act to allow the elastomers to seat and to unseat without causing lock-up. The discs are retained between plates and snap rings.

Abstract: An acceleration sensor including a block having comb-like projections forming three cantilever beams. A semiconductor filament is then fixed in tension between each adjacent pair of the beams. The beam on one extreme side has a length equal to that of the beam on the other, whereas the center beam is longer than the other two.

Abstract: A fluid flowmeter of the vortex shedding type. The vortices are detected from their optical Schlieren effect on a focused optical system, the vortex frequently giving a measure of fluid flow rate. The optical components of the flowmeter may be mounted within a wedge-shaped bluff body placed in the fluid stream.

Abstract: A method of making a non-corrosive plastic bellows by ultrasonic welding inner and outer flanges of discs with cylindrical and half-cylindrical horns, respectively. The half-cylindrical horn and a fixture used therewith have lips to fit on opposite sides of a pair of contacting outer flanges and in between two pairs of flanges. The inner flanges are thus welded first.

Abstract: A silicon transducer including a silicon frame with one or more lands extending from a diaphragm or the like. The lands are interconnected by two thin strips formed integrally with the lands. The strips are essentially the transducer. The transducer is constructed by etching a boron doped wafer with a mixture of catechol, ethylene diamine and water.

Abstract: A net oil computer including a mean density electric current source that alternately supplies all of or a portion of water density and oil density electric currents with the differences between the mean and water currents and between the mean and oil currents alternately charging and discharging a capacitor between two different voltage levels or vice versa. A bistable circuit switches the capacitor to charge and discharge when the capacitor voltage reaches the respective two different levels. One or both of the capacitor charging and discharging periods may then be used to gate turbinemeter pulses, the number of which is proportional to total oil flow and/or total water flow in a pipeline.

Abstract: A pressure fitting formed of fire resistant material, preferably stainless steel, contains a chamber communicating through an opening with a pressure responsive switch or other assembly formed at least in part of a less fire resistant material, such as aluminum, with a movable seal member being provided for transmitting force to a movable part of the assembly, and with a valve member which is also high temperature resistant being provided to automatically close off fluid flow from the chamber through the opening in the event of fire. The temperature response may be obtained by release of the valve resulting from melting down of part of the pressure responsive assembly, or by melting of a fusible element retaining the valve in open condition, or by both of these effects.

Abstract: A visual warning apparatus of the type used on police and fire department and other emergency vehicles in which a reflector is positioned relative to a rotating signal light so when the light rotates, light rays deflected off the reflector will extend forwardly of the vehicle while producing a lateral shifting of the light rays. The reflector comprises a plurality of convex sections which produce a highly active light signal.

Abstract: A differential pressure .DELTA.p is detected across an orifice plate in a pipe section. The same differential pressure is also allowed to drive a turbine meter. The turbine meter is conventional and produces electrical output pulses at a frequency f.sub.1 proportional to the volume flow rate therethrough. It then has been found that the properties of a fluid in the pipe section and in the turbine meter may be found automatically by electronic computation of first and second ratios.DELTA.p/f.sub.1and.DELTA.p/f.sub.1.sup.2respectively, where the first and second ratios are proportional to mass flow rate of the fluid in the pipe section or total mass flow when the mass flow rate is integrated with respect to real time, and the density of the fluid respectively.

Abstract: A vibration densitometer having a magnetostrictive drive with a coil and a crystal pickup. A loop circuit including a driver amplifier provides the coil with a voltage twice that ordinarily provided. Further, the driver amplifier is unusually small, inexpensive and accurate.

Abstract: Two arms carry two pawls each. One pawl of each arm engages one ratchet wheel and, alternately, the other pawl of each arm engages another ratchet wheel when the arms are moved at the end of the travel of a ribbon. The ratchet wheels carry ribbon spools. One arm carries push pawls. The other carries pull pawls. The push pawls act as no-backs, but they also drive the ratchet wheels. Each ratchet wheel is thus positively driven more or less continuously when it is driven. The ratchet wheels are driven alternately. An over-center transfer mechanism places a desired pair of pawls in position for ratchet wheel engagement and the other pair for disengagement at each end of the ribbon travel.

Abstract: A plastic laminate including a wedge having sides with a large radius and one or two grooved plates, flat when unstressed, and stressed when clamped to the wedge to conform to the radii thereof. The grooves then are three-dimensional and easily guide the print wires of a mosaic printer. Another advantage is achieved in that both wedge and plates can be molded with little or no difficulty in that the wedge mold surfaces are simple to machine, and the plates are initially flat and thus easy to mold. Close solenoid spacing is also made possible.

Abstract: A spring biased jig or the like for holding an electrical connector and a flat cable in position to terminate the cable.

Abstract: A flue gas analyzer including a probe module to condense water vapor, a sampling module, and a titration module including an SO.sub.2 scrubber, a thermal oxidation device and a coulometric titrator.

Abstract: A fluid flow sensor of the vortex shedding type. Pressure differentials caused by shed vortices operate a piston system to vary the coupling between a pair of optical fibers thereby modulating light signals passing along the fibers.

Abstract: A circuit including a strain gage bridge having a constant current supply at a constant temperature and otherwise variable with temperature. Linearization and accuracy are obtained through a feedback connection. The constant current and temperature compensation features and common mode rejection are also employed to improve accuracy.