VOL. 2 (1958/59) Sl%TEMATIC ABSTRACTS 499

6. ANALYSIS AND TESTING

Measuring the Attack of Gases on Solid Surfaces. Corrosion Technology, v. 6, Jan. 1959. p. g. Procedure employs time-lapse photography of the reacting solid so that a permanent record of the reaction’s progress is obtained.

Investigation of Wear by Electron Diffrac- tion. L. M. Niebylski, M. Antler, and L. 0. Brock- way. ASLE Transactions, v. I, no. 2, Oct. 1958, p. 304-311. Discusses monolayers, liquid lubricants, and greases, polished and amorphous films, the relation to wear of the crystallite size of sur- face films, solid lubricants, mechanism of extreme pressure lubrication, and the iden- tification of wear debris. Molybdenum isobu- tylxanthate is an effective extreme pressure oil additive for hard steel. Cast iron top-piston- ring durability in a spark-ignition engine was studied using several fuels which gave widely different wear rates.

Recherche d’un test rapide d’abrasivith. An Attempt to Find a Quick Abrasivity Test. P. Draignaud. So&% Francaise de Ckramique, Bulletin, no. 41, Oct.-Dec. 1958, p. 47-64. Test involves rotating the metal bar to be tested in a bed of quartz grains of 10-15 mm size.

Contributional’Ctudedel’usured’unmoteur par la technique des traceurs radioactifs. Study of motor wear by tracer technique. R. Wilputte. Belg. Chem. Ind., v. 12, 1958, p. 1374-1378; 3 fig., 6 ref. A simple apparatus is described for the mea- surement of engine wear by the radioactive ring method. This process has proved useful : for comparing the “anti-wear” properties of different lubricants during continuous run and on starting; for investigating how engine wear on starting can be reduced.

Preliminary Study of A Piston Pump for Cryogenic Fluids. Arnold E. Biermann and Robert C. Kohl. NASA Memorandum 3-6-59E. March 1959. 27 pp., diagrs., photo’s, Preliminary performance data are presented for a low-speed, five-cylinder piston pump designed to handle boiling hydrogen. The pump is designed to deliver 55 gallons per minute at a discharge pressure of I 35 pounds per square inch. The design pump speed is 240 rpm. The report also describes asso- ciated cavitation experiments in which liquid nitrogen and water were subcooled at 0.6’ F by reciprocating a disk in an open vessel containing the test fluids. This method produced a lesser amount of subcooling with liquid hydrogen.

7. SURFACE TREATMENT AND FINISHING

Effect of Surface on the Behaviour of Metals. IOO pp. + 10 plates. 1958. Philosophical Li- brary, New York. Contains the four papers presented at the Institution of Metallurgists’ annual Refresher Course for 1957. entitled “Methods of Prep- aration and Examination of Surfaces”; “In- fluence of Surface Treatments on the Chemical Behaviourof Metals” ; “Relationship Between Surface Condition, Friction and Wear”; and “Influence of Surface on the Physical Proper- ties of Metals”.

of the misorientations-and hence the mag- nitude of the deformation at the surface- produced by polishing decreases progressively with increasing fineness of polish. With the finest polish investigated, the misorientations were only about f5”. No evidence was found of a layer of peculiar structure of the type postulated by Beilby.

The Nature of Mechanically Polished Metal Surfaces : An Electron-Diffraction Exami- nation of Polished Silver Surfaces. L. E. Samuels and J. V. Sanders. Institute of Metals, Journal, v. 87, pt. 5. Jan. 1959, p. 129-135. Electron-diffractionpatterns characteristicof crystalline material, obtained from surfaces of both polycrystalline and single-crystal sil- ver polished mechanically by a standard metallographic method, show that the range

Finishing and Inspection of Model Surfaces for Boundary-layer-transition Tests. Max E. Wilkins and John F. Darsow. NASA Memorandum x-19-594, February 1959. 17 pp., diagr., photos. Techniques which have been used for finishing and quantitatively specifying surface rough- ness on boundary-layer-transition models are reviewed. The appearance of a surface as far as roughness is concerned can be misleading when viewed either by the eye or with the aid of a microscope. The multiple-beam inter- ferometer and the wire shadow method pro- vide the best simple means of obtaining quan- titative measurements.