7. I;. Ii. Orcutt. I). 1:. Dougherty, S. I<. Malanoski and C H. T. Pan, T+zvestigatio?z of externally
pvessuvised
journal benvi~lgs, pp. 5 tables, 8 rcfs.
steam-lubricated
7rj~-7,3o,
8 figs.,
Papers on Gas Bearings in Instruments. 8. ‘w. G. Denhard and C. H. T. l’an, Applicatiow of gus-lubricated bearings to instrztmmts, pp. 7.31-740, 9 figs., 5 tables, 0
refs. A discussion of the types of bearings applied to instruments covering generalised dimensional requircdesign, materials, ments and theory. 9. A. G. Patterson, Heview of gas-bearing gyro development in the United Kingdom, pp. 741-752, 20 figs., 14 tables, 21 refs.
10. W. H. Keating
and C. H. T. I’an, Design
studies of alz opposed spin axis gas bearing,
hrmispheve gyro pp. 75.3 -700, I3
figs., 3 tables, II refs. I I. I<, S. Side11 and H. H. Richardson,
A
step bearing accelerometer with plzeumatic signal output, pp. 761-768, 13 figs., 7 refs. 12. S, I,. Zedekar, The effect of viscous and pressure gradrent torques ON a free yotor gyroscope, pp. 769-772, 2 figs.
Papers 13. Ii.
on Numerical Methods. Coleman, The numevicul
linear 8 refs.
elliptic
equations,
pp.
solution of 773-770,
14. 1’.
Castelli and J. I’irvics, Review of ~zumerical methods in gas bearing analysis, pp. 777-792, 4 figs., 38 refs. 15. J. W. Lund, Calculation of stiffness and damping pvopevties of gas beavings, pp. 793-803. II figs., I table, 14 refs. Papers on Porous Bearings. 16. H. J. Sneck, A survey of gas-lubricated porous beavzngs, pp. 804~809, 9 figs., 30 refs. .X review of the literature pertaining to the theory of porous gas bearings, their experimentally observed behaviour and their applications. ‘7. 1J. I’ Garguilo and P. W. Gilmour, A numerical solution fey the design of extevxally presswised porous gas bearings: thrust bearings, pp. 810.817, 14 figs., 12 rcfs. 18. S. F. Murray and M. B. I’eterson, Matevial considerations for pad gas bearings, 4 tables =j refs.
high temperature tilting pp. 818~828, 21 figs.,
19. H. H. Rowe,
An ilzvestigation of methods to improve the wear resistance ofgas bearing cevanzic materials. pp. 829-840, 21 figs., T7 refs.
IVear, 13 (1969) 135-143
The paper reports the rt,sults of an ~11 vestigation of methods designed to inn prove the resistance of aluminium oxitlt, to damage from sliding contact and henw improve stop--start life of gas bearings The effect of machining techniques, thcil relation to surface finish and wear resistancc of gas bearing components is men tionetl. 20. N. S. Stoloff, Some ,bvoblrms iu higictemperatuw heaving matevials, pp 8.j1 845, 8 figs., 2 tab&, 7 refs. 21. Ii. E. Maringer and .X. G. lmgram, Effects of some processing zla&zbles ON dime&nlzal stability, pp. 84h+ 849, 4 figs., I table.
22. G. 1). Calvin, D. W Morccroft and A. G l’atterson. Tjeuelopments ix supevcleaning and bowzdavy lubvicatiou~ fov gas beaviwg gyros wlated to swface phr?zome+za. 8j0~801, 12 figs., .+tables, (0 refs.
pp.
4.2. Seals. bvnkes and grays The Influence of Environment on Seal Selection. G. kV. Halliday, TYibology, I (I) (1g68)2jP2f>; 2 figs., T table. The first of a series of articles on sealing. Environment is interpreted in its widest sense. Internal and external factors such as temperature, and nature of the fluid to be sealed are considered. Service factors such as maintenancc facilities and commercial factors are also discussed. The Selection of Elastomers for Seals. C. M. Blow, Tribology, I (2) (1968) 81-84; 7 figs., 4 tables, T ref. The author considers the factor of tcmperature, particularly the higher ranges, in so far as it determines the choice of elastomeric material for a seal. Silicone, fluorosilicone and fluorocarbon although expensive are finding more uses as their special properties and stability justify their USC. Survey of the Theory of Mechanical Face Seals-II. Friction and Wear. L. H. Bernd, Lubrication Eng., 24 (II) (1968) 525-530; 14 figs., 2 tables, 25 refs. The author discusses the role of friction and wear in seal pcrformancc and reviews the properties and types of seal material available for different applications. Fundamental Research on a Radial Face Seal. J. G. Pape, ASLE Tram , II (4) (1968) 302-309; 9 figs., 18 refs. The author has attempted to establish a description of the basic lubricating mechanism in a radial face seal. The experimental apparatus and measuring techniques are briefly described. A simplified theory that takes Into account the macroroughness of the