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The behavior of wrought manganese bronze exposed to corrosion, while under tensile stress
554
L_?. S. BUREAU
OF STANDARDS
NOTES.
[J. I;. I.
representatives of the paint and varnish industries, including all of the large manufacturers of linseed oil, and gave careful consideration to the large number of replies received in time.
OXYGEN CONTENT BY THE LEDEBUR METHOD BESSEMER STEELS DEOXIDIZED IN VARIOUS By J. R
Cain and Earl
OF ACID WAYS.‘”
Pettijohn.
[ABSTRACT.]
IT IS shown that the Ledebur method for determining oxygen in steels indicates no marked difference in oxygen contents of steels practically identical as to chemical composition and heat treatment, but made by different deoxidation treatments. Some differences in physical properties of such steels are shown.
THE BEHAVIOR OF WROUGHT POSED TO CORROSION, WHILE By P. D. Merica
MANGANESE BRONZE EXUNDER TENSILE STRESS.”
and R. W. Woodward.
[ABSTRACT.]
SPECIMENS of wrought manganese bronze rods were exposed in special steel test frames to corrosion in water and moist air while at the same time under tensile stress with the object of determining the maximum safe stresses for this material under these conditions. While the period of exposure was only two years and the initial condition of the best bars not normal in that anneal, the initial stresses had been removed by a low temperature the results of the tests are capable of some general interpretations. None of the test bars fractured within this period under stresses below the proportional limit, and four of the bars withstood corrosion during this period under stresses which produced slight yielding and permanent set when first applied. Fracture did not occur under stresses less than 35,000 pounds per square inch. U Scientific Paper No. 346. ” Technologic Paper No. 135.
Oct..
J919.1
One square 40,000 limit of imately
u.
s.
I?UKEAU
OF
STANDARDS
?UrOTES.
555
specimen with a proportional limit of 35,000 pounds per inch fractured under a t,ensile stress of approximately pounds per square inch, and another with a proportional 42,500 pounds per square inch, under a stress of approx43,000 pounds per square inch.
APPLICATION
OF THE INTERFEROMETER ANALYSIS.‘” By Junks
TO GAS
David Edwards.
[ABsTRAC-~.J
ONE of the most useful of the physical methods applicable to gas analysis is that of gas interferometry. By the applicatioln of a new method pf cal,ibration, previously described in Scientific Paper No. 316, the use of the gas interferometer has been simplified and extended. The relation hetwen the refractivities of the gases and the indications of the interferometer is discussed for various typical cases and illustrative cal’culations given. The determination of helium in a mixture of gases is one case of interest which is discussed. It is of importance because of the scarcity of analytical methods for determining helium. Other cases discussed are the effects of variations in the composition of air where it is a component of mixtures under test, the analysis of flue gases, the reiative sensitivity of the interferometer for different gases and points about the operation of the interferometer.
EXPERIMENTAL-RETORT
TESTS
By R. S. McBride
OF ORIENT
COAL.‘”
and I. V. Brumbaugh.
[ABSTRACT.]
THE Bureau of Standards in connection with coke-oven investigations found it desirable to carry out a short series of experimental-retort tests of Illinois coal to determine the influence of temperature of coking upon the characteristics of the ‘6Technologic Paper No. 131. ‘“Technical Paper No. 134.
L_?. S. BUREAU
OF STANDARDS
NOTES.
[J. I;. I.
representatives of the paint and varnish industries, including all of the large manufacturers of linseed oil, and gave careful consideration to the large number of replies received in time.
OXYGEN CONTENT BY THE LEDEBUR METHOD BESSEMER STEELS DEOXIDIZED IN VARIOUS By J. R
Cain and Earl
OF ACID WAYS.‘”
Pettijohn.
[ABSTRACT.]
IT IS shown that the Ledebur method for determining oxygen in steels indicates no marked difference in oxygen contents of steels practically identical as to chemical composition and heat treatment, but made by different deoxidation treatments. Some differences in physical properties of such steels are shown.
THE BEHAVIOR OF WROUGHT POSED TO CORROSION, WHILE By P. D. Merica
MANGANESE BRONZE EXUNDER TENSILE STRESS.”
and R. W. Woodward.
[ABSTRACT.]
SPECIMENS of wrought manganese bronze rods were exposed in special steel test frames to corrosion in water and moist air while at the same time under tensile stress with the object of determining the maximum safe stresses for this material under these conditions. While the period of exposure was only two years and the initial condition of the best bars not normal in that anneal, the initial stresses had been removed by a low temperature the results of the tests are capable of some general interpretations. None of the test bars fractured within this period under stresses below the proportional limit, and four of the bars withstood corrosion during this period under stresses which produced slight yielding and permanent set when first applied. Fracture did not occur under stresses less than 35,000 pounds per square inch. U Scientific Paper No. 346. ” Technologic Paper No. 135.
Oct..
J919.1
One square 40,000 limit of imately
u.
s.
I?UKEAU
OF
STANDARDS
?UrOTES.
555
specimen with a proportional limit of 35,000 pounds per inch fractured under a t,ensile stress of approximately pounds per square inch, and another with a proportional 42,500 pounds per square inch, under a stress of approx43,000 pounds per square inch.
APPLICATION
OF THE INTERFEROMETER ANALYSIS.‘” By Junks
TO GAS
David Edwards.
[ABsTRAC-~.J
ONE of the most useful of the physical methods applicable to gas analysis is that of gas interferometry. By the applicatioln of a new method pf cal,ibration, previously described in Scientific Paper No. 316, the use of the gas interferometer has been simplified and extended. The relation hetwen the refractivities of the gases and the indications of the interferometer is discussed for various typical cases and illustrative cal’culations given. The determination of helium in a mixture of gases is one case of interest which is discussed. It is of importance because of the scarcity of analytical methods for determining helium. Other cases discussed are the effects of variations in the composition of air where it is a component of mixtures under test, the analysis of flue gases, the reiative sensitivity of the interferometer for different gases and points about the operation of the interferometer.
EXPERIMENTAL-RETORT
TESTS
By R. S. McBride
OF ORIENT
COAL.‘”
and I. V. Brumbaugh.
[ABSTRACT.]
THE Bureau of Standards in connection with coke-oven investigations found it desirable to carry out a short series of experimental-retort tests of Illinois coal to determine the influence of temperature of coking upon the characteristics of the ‘6Technologic Paper No. 131. ‘“Technical Paper No. 134.