Abstract: At least one air pollutant is concentrated at the source from which the sample of air is obtained. The thus concentrated at least one air pollutant is provided through conduits to a central analyzer for analysis. Concentration of the air pollutant results in reducing transport losses and also the sensitivity of the detector utilized to detect the at least one air pollutant can be greatly increased.

Abstract: By measuring the volume of return flow of cleaning liquid, such as perchlorethylene, from the still, reclaimer and sniffer portions of a dry-cleaning system to the main or reserve cleaning-agent storage tank thereof, the efficiency of the system's use of the cleaning agent can be continuously audited and the steam-heating of the still, reclaimer and sniffer portions can be limited in time to those times when such heating produces a flow of re-claimed cleaning fluid to the main or reserve tank, thus limiting the consumption of the energy consumed in the steam generation process while conserving dry-cleaning liquid and assuring optimum system operation.

Abstract: A quantitative analysis of the concentration of an eluted component, the dielectric constant of an eluted component and/or the refractive index of the eluted component is obtained using a chromatographic analyzer in combination with both a refractive index detector and a dielectric constant detector without the need to calibrate either the refractive index detector or the dielectric constant detector for each component in a sample. The dielectric constant detector and the refractive index detector are utilized to analyze a sample provided from a chromatographic analyzer. The concentration of the eluted component is a function of the magnitude of the output from each of the detectors. In like manner, the dielectric constant of the eluted component and the refractive index of the eluted component is a function of the output from the two detectors.

Abstract: A coupler assembly for limiting lateral forces which may be generated during the highway operation of a trailer coupled to a towing vehicle. The present invention is part of the yoke of the trailer, and comprises a completely self-contained system for momentarily actuating the brakes on the towed vehicle, in response to undesirable lateral accelerations of the towed vehicle. The invention is characterized by a coupler member which itself is relatively rotatable, in a lateral plane, with respect to the trailer yoke, together with dampening spring assemblies, so there is a surge-brake actuation in response to lateral accelerations above a predetermined magnitude.

Abstract: 2,4- AND 2,6-Dinitrotoluenes mixed with small amounts of isomeric dinitrouene impurities are extracted with an alkane of 5 to 8 carbon atoms, whereby the isomeric dinitrotoluene impurities are removed.

Abstract: 2,4- AND 2,6-Dinitrotoluenes are separated from mixtures thereof with small mounts of isomeric dinitrotoluene impurities by suspending the mixture in an aqueous solution containing a small amount of an alkali metal disulfide. The isomeric dinitrotoluene impurities are thereby converted to products soluble in the aqueous solution from which the 2,4- and 2,6-dinitrotoluenes can be recovered in excellent yield.