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L'arious "fields" are delineated and marked specifically.cards with the complete computation. The deck is now run through an "accounting machine," which reads the information in the holes and makes a printcd record of all the information. Figure 3 shows a section of the final table giving the values of Rt for every degree, and all the computations in the event thatColumns 1 to 4 contain the value of t (the temperature): columns 5 to 10 the values of t2; columns 11 to 18 the values of ( t -100jt3;columns 19 to 24 the value of Ro, and so on. For automatic calculation, Formula 3 has been replaced by the equivalent formula: checking is necessary.wliere K = Ro.4, L = ROB, and . 1 f = RcC. In this equation, the four constants KO, K , L , and .If define the resistance of a given thermometer.Values of 1, t 2 , and ( t -lOO)t3 from -200" to +500" C. weri:computed and punched into 700 cards in the first 18 columns. Each card represents one temperature value. Kest, the value of K O is "gang punched" (in each cnrd) by running the whole deck through th,e high speed reproducer. In the same operation the information in columns 25 to 32 (number of the platinum resistance thermometer and the cards with negative temperatures) is alqo gang punched.After locking the value of li into a "multiplier," and passing the deck through, the multiplier will punch product Kt in rolumns 38 to 45, a t the rate of about 700 cards per hour. I n like manner, products Lt2 and '$1 ( t -100)t3 are multiplied and punched in columns 46 to 62. lThe Droduct ,kl(t -100)t3 is reouired onlv on ' negative values of t. jThe deck is now run again through the multiplier, which is now wired to add these products algebraically to the IZO term and punch the Rt sum in columns 74 to 80. Figure 2 shows one of the Thus in approsiniat,ely 4 Iiours' machine time the entire computation of 700 temperatures is complet,e, and a printed record (triplicate if desired) of all the romputations is rendered.A portable device for sampling air contaminants permits the scrubbing of large volumes of air by a small volume of liquid. This facilitates chemical analysis of the collected materials by making it possible to obtain relatively high concentrations of contaminants in the scrubbing liquid. The action of this portable field unit is based on the principle used in the Venturi scrubbers employed to remove fumes from industrial stack gases. Its efficiency for the collection of several gaseous and particulate air pollutants is discussed. These pollutants include ammonia, sulfur dioxide, sulfuric acid, and sodium chloride.

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The smog of Los Angeles is unique in that it sometimes produces severe and disagreeable eye irritation.In common with the smog in other parts of the country, however, it also imparts a murkiness to the atmosphere. Eye irritation is severe on some twenty occasions during a year, and then in only limited areas and for relatively brief periods of time.Reduced visibility in connection with smog occurs very much more frequently. The peculiar meteorology of the Los Angeles area appears to be decisive in controlling the time and duration of eye-irritating smog.Studies of meteorological influences have revealed an empirical correlation between certain meteorological factors and the time of occurrence of eye irritation from smog.This correlation gives promise of being useful as a means of forecasting such smog. The nature of the substances in smog that cause the eye irritationis not yet