Consolidated Engineering Corporation

The expressions for the second-order velocity aberration and the second-order angle-velocity aberration are given for a sector shaped electromagnetic analyzer with superimposed electric and magnetic fields. Focusing is in one plane.

Mass spectrometer techniques for the analysis of automobile exhaust gases and a gas-sampling procedure are presented.The hydrocarbon content of such exhaust varies with engine speed and approaching steady state at high speed; formation of N oxides increases with engine speed.This technique shows promise for the study of air pollution.Results indicate that the hydrocarbons in the exhaust gases from a car with engine idling consist of approx. 50% gasoline and 50% gasoline cracking products.The products formed from lubricating oils are not considered since their amount does not appear to be significant.Total water content of the gas was used as a measure of representative sampling.

A number of S compounds are detected and their concentration is continuously recorded by measuring the Br uptake in the reaction, RSR + Br₂ + H₂O = R₂SO + 2HBr.COS and CS₂ do not react.Olefins and phenols interfere to a small degree.The instrument operates by generating Br in a HgBr titration cell.Introduction of a S compound causes a momentary drop in Br concentrationThis causes a drop in the e.m.f. of a Pt-HgBr sensor cell which then causes an amplifier to increase current to the Br-generating cell.Thus Br concentration remains steady.The Br-generating current is recorded and is directly proportional to the S-compound concentration in the sample.The maximum sensitivity is 0.1 p.p.m.The instrument must be calibrated for each S compoundReproducibility is ±5%.Applications to monitoring of natural gas, gas odorization, air-pollution studies, corrosion studies, safety equipment, and catalyst protection are discussed.