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2551. Leather. Apparatus for measuring relative wear of sole leathers, and results obtained with leather from different parts of hide; by R. W. Hart [and] R. C. Bowker.

Corporate/Agency Authors:: Standards Bureau, Publications Division, and Commerce Department
Publisher:: Standards Bureau
Date:: Nov. 22, 1919

2552. Vacuum-tubes. Dependence of input impedance of 3-electrode vacuum tube upon load in plate circuit; by John M. Miller.

Corporate/Agency Authors:: Standards Bureau, Publications Division, and Commerce Department
Publisher:: Standards Bureau
Date:: Nov. 21, 1919

2553. Coking of Illinois coal in Koppers type oven, operating test at St. Paul plant of Minnesota By-Product Coke Co. conducted jointly by National Bureau of Standards and Bureau of Mines, by R. S. McBride and W. A. Selvig; [with Summarized report of test, by F. W. Sperr, jr.].

Corporate/Agency Authors:: Standards Bureau, Publications Division, and Commerce Department
Publisher:: Standards Bureau
Date:: Nov. 17, 1919

2554. Duralumin. Heat treatment of duralumin; by P. D. Merica, R. G. Waltenberg, [and] H. Scott.

Corporate/Agency Authors:: Standards Bureau, Publications Division, and Commerce Department
Publisher:: Standards Bureau
Date:: Nov. 15, 1919

2555. Concrete. Tests of 18 concrete columns reinforced with cast iron; by John Tucker, jr., and J. G. Bragg.

Corporate/Agency Authors:: Standards Bureau, Publications Division, and Commerce Department
Publisher:: Standards Bureau
Date:: Nov. 14, 1919

2556. Fireproofing. Comparison of heat insulating properties of some of materials used in fire-resistive construction; by Walter A. Hull.

Corporate/Agency Authors:: Standards Bureau, Publications Division, and Commerce Department
Publisher:: Standards Bureau
Date:: Nov. 12, 1919

2557. Steel. Oxygen content by Ledebur method of acid Bessemer steels deoxidized in various ways; by J. R. Cain and Earl Pettijohn.

Corporate/Agency Authors:: Standards Bureau, Publications Division, and Commerce Department
Publisher:: Standards Bureau
Date:: Nov. 11, 1919

2558. Steel. Equilibrium conditions in system carbon, iron oxide, and hydrogen in relation to Ledebur method for determining oxygen in steel; by J. R. Cain and Leon Adler.

Corporate/Agency Authors:: Standards Bureau, Publications Division, and Commerce Department
Publisher:: Standards Bureau
Date:: Nov. 10, 1919

2559. Gas tubing. Tests of flexible gas tubing, by R. S. McBride and Walter M. Berry; with report on Gas-tubing inspection in Newark, N. J., by Ellsworth Francisco.

Corporate/Agency Authors:: Standards Bureau and Commerce Department
Publisher:: Standards Bureau
Date:: Oct. 27, 1919

2560. Aluminium. Mechanical properties and resistance to corrosion of rolled light alloys of aluminum and magnesium with copper, with nickel, and with manganese; by P. D. Merica, R. G. Waltenberg, and A. N. Finn.

Corporate/Agency Authors:: Standards Bureau and Commerce Department
Publisher:: Standards Bureau
Date:: Oct. 25, 1919

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