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If you have not received a copy of it already please notify us at once.

The COLEMAN & BELL Co., Inc. Manufacturing Chemists: Norwood, Ohio, U.S.A.

COLEMAN £ BEIL FOR BETTER

(hnêtoù ondWATER TESTS

Ui

61ASS COIOR.

STANDARDS

Pocket

Comparator

N o . 605

Permanent reliability of Hellige Glass Color Stan· ordt, accuracy of color comparison, simplicity of tho technique, and compactness of the apparatus are exclusive features of Hellige Comparators not found in any similar outfits.

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3718 NORTHERN BLVD.. LONG ISLAND CITY 1.N.YC

jReteavca 'Pto4>ie44> Porosity of Nickel

The research committee of the American Electroplaters' Society reported recently triat the porosity of electroplated nickel foil varies with the crystal structure of the deposit,. Since it has been generally con­ceded that wrought foils are less porous than similar clectrodeposited foils from commercial baths, this discovery may well prove "to be the cornerstone for improving t l ie corrosion resistance of nickel electro-deposits. Future researches on this sub­ject will determine if nickel baths operat­ing under commercial conditions can be modified to give a crystal structure with a n improved corrosion resistance.

He3 JFlaw Data DwrraW W. Osborne, Bernard Wein-

stock, and Bernard M. Abraham of the chemistry division of Argonne National Laboratory, Chicago, have determined that liquid He3 does not have a transi­tion t o a superiluid state such as that ex­hibited by liquid l ie 4 . The rate of iso­thermal flow of liquid He3 was observed t o decrease nioiiotonically as the tem­perature was lowered. In contrast, the rate o>f flow of liquid He4 through the same channel was observed to decrease as the temperature was lowered, until the lambda, point of 2.19° K. ( - 4 5 6 ° F.) was reached, and below this point the rate rose very sliarply.

Since He3 is present in ordinary helium

only a.o one part in 10 million, experi­ments» involving the use of isotopically pure He3 previously have been impossible. However, the Argonne group was able to perform the research because of the availability of appreciable quantities of He3 of which the laboratory is the pro­ducer.

From the results obtained, it is clear that no superfluid transition occurs in He3

down to 1.05° K. ( - 4 5 7 . 8 ° F.).

OTS Reports π Details on a device for continuously

recording the concentration of nitrogen in gas mixtures by photoelectric means are contained in report PB-95882 (32 pages, photostat $5.00, microfilm $2.25). The nitrogen meter, developed by the Uni­versity of Pennsylvania under government contract for the evaluation of oxygen sup­ply systems used in high-altitude flying, is expected to have other applications in the field of analytical gas chemistry. The meter will indicate air leakage into oxygen masks, or rate the performance of supply-systems using oxygen diluted with air. It is effective in low-pressure chambers used in simulation of high altitudes, and is use­ful in medical research :n lung function. The report is available from the Library of Congress, Photoduplication Service, Publi­cation Board Project, Washington 25. D. C

Evaluatorfar Chemicals as Insecticides Modified Hoshins spray chamber for preliminary evaluation of chemicals as in­secticides is demonstrated at Monsanto Chemical Co.9s entomological labora­tories in St. Louis. Precision Potter nozzle gives an exceptionally uniform spray pattern, precise and reproducible results. Test insects are exposed in the enclosure beneath far end of cylinder. Λ standard test, consisting of a 10-sccon*J spray and a 30-second settling mist, is being run

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