Abstract: A densitometer for use by itself or in a net oil computer. The densitometer includes two differential pressure units to detect the difference in pressure between two corresponding pairs of points and the differences substracted to provide a corrected density output signal. This output signal is then essentially independent of viscosity and/or other variables.

Abstract: A bluff body is placed in a fluid pipe with one flat face facing the oncoming fluid. Vortices are then generated and shed alternately from opposite edges of the body. This body is of a scalene triangle cross section, and in one version a hole extends transversely therethrough. A longitudinal hole intersects the first hole at right angles thereto. The vortices cause oscillations in the transverse hole. A light beam is provided in the longitudinal hole. The light beam is modulated as it crosses the path of the transverse hole. Hence by measuring the frequency at which the beam is modulated and by suitable calibration, one gets a good and reliable indication of fluid flow rate. In a second version the transverse hole is formed into a blind hole at the foot of which is an etalon (a Fabry-Perot interferometer). The effect of the fluid oscillations due to vortex generation influences the etalon so that its output is a measure of the fluid flow rate.

Abstract: The metal substrate of an electrophotographic member is provided with a selenium-tellurium alloy layer containing 5-30% tellurium, 10-5,000 ppm of a metallic element of the fifth main group, and 10-100 ppm of a halogen. A preferred embodiment contains 15% tellurium, 40 ppm arsenic, and 40 ppm chlorine. The addition of the metallic element of the fifth main group to the selenium-tellurium alloy results in a stabilization of charging potentials in multicycle operation.If the metal substrate is an aluminum drum, the electrophotographic member can be used as a copying drum in high-speed copiers.

Abstract: A quartz tuning fork in a chamber adjacent a gas pipeline carrying a turbine flowmeter. The chamber is connected across the flowmeter turbine to receive a gas at a flow rate high enough to cause the tuning fork to vibrate. A main output frequency is developed which is directly proportional to the product of a function of the tuning fork period of vibration and the turbine meter output signal frequency. The main output frequency is then counted and is displayed on an indicator, the constants of the circuit being so selected that the indicator displays total flow in units of mass. The density sensor measures the gas density at the turbine flowmeter rotor location. This obviates the requirement for expansion factor corrections.

Abstract: A semiconductor gas sensor comprises an insulating substrate (11) on which a resistive heater track (15) coupled to a pair of electrodes (12, 14) is deposited. A film (16) of a semiconductive metal oxide, typically a doped oxide, is ion-plated on to the assembly so as to contact the resistive track (15) and a further electrode (13). Exposure of the device to a particular gas, e.g. hydrogen sulphide, reduces the resistivity of the semiconductive film (16), this change being detected via an amplifier circuit (not shown). In an alternative version of the sensor (FIGS. 5a, 5b and 6) the heater is disposed under a dielectric layer, the semiconductive film being ion-plated onto the dielectric layer and electrodes therein.

Abstract: A plastic ribbon guide to fit on a print head of a mosaic printer. The printer is a ticket printer which holds the ribbon in a stable position adjacent the tray which also acts as an anvil. The ribbon is kept taut. The ribbon guide has a shape to hold the ribbon in a positive manner.

Abstract: Elemental sulfur is recovered from acid gas containing hydrogen sulfide (H.sub.2 S). Such H.sub.2 S may be produced from any conventional source such as an amine desulfurization plant. The acid gas and the H.sub.2 S therein is contacted with oxygen (O.sub.2) or the oxygen in air in a stoichiometric amount such that one-third, by weight, of the flowing H.sub.2 S is oxidized (the H.sub.2 S is measured and the O.sub.2 thereby controlled). Oxidation takes place thus:H.sub.2 S+3/2 O.sub.2 .fwdarw.SO.sub.2 +H.sub.2 OThe sulfur dioxide (SO.sub.2) indicated in the equation above is then further reacted in a conventional Claus process sulfur recovery plant with the balance of the H.sub.2 S. That is, due to the fact that only the said one-third of the H.sub.2 S is oxidized, there is a two-thirds remainder of the same and it is this two-thirds remainder which is referred to above as the "balance." This balance is converted to elemental sulfur (S) in the following manner:2H.sub.2 S+SO.sub.2 .fwdarw.3S+2H.sub.

Abstract: A liquid level system employs a bellows which is in flow communication with a differential pressure unit by a column of reference liquid. A float in the bellows carries a switch which energizes an alarm when liquid in the column is lost.

Abstract: A filter connector is disclosed in which the insulator thereof contains a slot which is parallel to and intersects a row of contact cavities in the insulator. A monolithic capacitor is mounted in the slot with its live electrodes aligned with and facing the contact cavities. A contact in each cavity embodies an integral outwardly extending spring finger which engages one of the electrodes on the capacitor. A rear insulator retains the contacts and capacitor in the cavities and slot, respectively.

Abstract: A liquid level system employs a pair of vertically spaced sensors in a tank such as a boiler. Each sensor includes a pair of bellows. The first bellows is enclosed by a protective enclosure while the second bellows is exposed to the interior of the tank. The first bellows of the two sensors are interconnected and filled with a liquid forming substance, such as an alkali metal, which is in liquid phase at high temperatures, while the second bellows of each sensor and the enclosure for the first bellows are interconnected and filled with a second liquid-forming substance, such as a metal alloy, which is essentially inert. A transducer is connected to one of the second bellows which produces an electrical output signal proportional to the difference between the pressures at the locations of the second bellows and, thus, the level of liquid in the tank.

Abstract: A welded vibration densitometer probe to obviate frequency shifts due to temperature changes.