1966, No. 3/4 107

Grease-lubricated spiral groove bearingfor a straight-through shaft

The spiral groove bearing is a new and very pro-mising form of "self-acting bearing", i.e. one in whichthe running surfaces are completely separated fromeach other by a thin layer of lubricant and in whichthe rotation itself forces the lubricant between therunning surfaces. This latter action is achieved in thepresent case by the pumping action ofthe spiral groovesOil may be used as a lubricant, but grease is also suit-able, especially for small bearings (shaft diameters of afew millimetres). The great advantage of grease is thatit does not leak away from the bearing so readily whenthe shaft is stationary.

These points were explained in detail some time ago inan article in this journal [11. This article included anillustration (fig. 26) of a small test motor with its shaftsupported at each end by a grease-lubricated conicalspiral groove bearing, capable of taking both thrustand radialloads. In the course of life tests, this motorhas meanwhile been run for 15 000 hours and, duringthis period, has been stopped and restarted about150000 times without being re-lubricated.The above relates to a "blind" bearing, i.e. one in

which the shaft terminates. The very good resultsachieved with the test motor encouraged us to look for

621.822.5 :621.892.9

Our solution to this problem is illustrated in fig. le.By way of explanation, let us first consider the simplestimaginable configuration for the required bearing, asshown in fig. la. The thrust bearing 1 has to take upthe axialload, and cylindrical bearing 2 the radialload.Bearing 1, designed for a bearing gap of, say,S to 10p.m, has spiral grooves, forcing the grease in the direc-tion of the arrow. The pressure thus set up increasesstrongly towards the centre and provides the requiredthrust load carrying capacity for bearing 1; at the sametime it ensures thatjournal bearing 2, which has a typi-cal clearance of 20 to 30 [.Lm,is always filled with grease.Bearing 2 is, therefore, itself capable of providing thenecessary radial bearing capacity. To prevent the greaseforced towards the centre by spiral grooves 1 from leak-ing away from the bottom of bearing 2, the latter mustbe provided with a series of helical grooves to pumpthe lubricant in the opposite direction.

In order to build up a pressure equal to that provided by bear-ing 1, the grooves in bearing 2, owing to the much wider gap andother causes, would have to be of quite considerable length. Itwould be better, therefore, to entrust part of this counter-pump-ing effect to a section of the thrust beating 1: its bearing surfacecan be divided into two rings, only the outer one being provided

Fig. 1. Grease-lubricated spiral groove bearing for straight-through shaft.a) The simplest possible form, with thrust bearing 1 and cylindrical bearing 2.b) An extension of this design, with arrangements to return the grease forced out of bearing 1

when the shaft is stationary.c) The final design. While the shaft is rotating, there is a small continuous flow of grease to the

annular space 6, from which it is returned to chamber 3 through channels 7.

Q

an anlogous design for use with a straight-throughshaft, i.e. a spiral groove bearing, capable of takingboth thrust and radialloads, that could be lubricatedwith grease and would require no further re-lubricationduring its life.

with the inwardly-directed pattern of spiral grooves, the innerone carrying a pattern giving the counter-pumping effect (aherringbone pattern, as shown in fig. 24 of reference (1]).

[1] E. A. Muijderman, New forms of bearing: the gas and thespiral groove bearing, Philips tech. Rev. 25,253-274,1963/64.

108 PHILIPS TECHNICAL REVIEW VOLUME 27

There are several reasons why the simple bearing infig. la is not entirely satisfactory. Firstly, the most ob-vious one: when the shaft is stationary, the thrust loadwill gradually force some of the grease in gap J out-wards, and this grease will accumulate around the outercircumference of the bearing. When the motor is startedthis grease will be thrown off by the centrifugal force,and eventually there will be insufficient grease to main-tain the lubricating film.

This can be counteracted by the design shown in fig.lb. Here, the shaft has a flange with an annular space 3containing a reserve of grease and which will collect thelubricant forced out of the gap 1 when the shaft is sta-tionary. As soon as the shaft begins to rotate, this greaseis forced outwards by centrifugal force and pressedagainst the inner wall of the bearing housing. Two setsof helical grooves 4 and 5 are cut in this wall, which bothhave a downward pumping action. The sole purpose ofgrooves 4 is to prevent some of the grease from escapingupwards, while grooves 5 pump the grease towards thethrust bearing 1, so that both this bearing and journalbearing 2 are always full of grease.

This does indeed correct the deficiency inherent inthe design shown in fig. la, but there is yet another andrather more subtle difficulty. Tt is difficult to balanceaccurately the opposed impelling forces that the groovesin bearings 1 and 2 exert on the grease, particularlybecause these forces will be determined by the thrustand radialloads, which can vary independently of eacheither. It is therefore impossible in practice to prevent aslight flow of grease. In order to overcome this diffi-culty, we have included a return channel for the greasethat is pumped away. The assembly is dimensioned insuch a way that the pumping action of bearing I, whichis reinforced by grooves 5, is always predominant. Asmay be seen in fig. Ic, the journal bearing has an annu-lar space 6 to catch the grease. Sealing from below isensured by the grooves in bearing 2, and there are anumber of return passages 7 from the cavity 6 to theannular space 3 at the input side ofthe thrust bearing 1.

The grease circulation on which the final design isbased has the further advantage that any air-bubblesthat might be left when the bearing is packed with

o 5 10em

Fig. 2. Parts of the new spiral groove bearing. The cylindricalbearing housing is shown on the left, and the rotating part, madeof hard material that is attached to the straight-through shaftis shown on the right. Here the groove patterns (1, 2, 4 and 5in fig. 1) are not cut in the wall of the bearing housing, but inthe hardened moving part; this makes no difference to the opera-tion of the bearing. The moving part is shown the opposite wayround from the housing so that the groove patterns may be seen.The ends of the grease channels, which, in this design, run in aslightly different way from that shown in fig. 1c (7), may be seenin the bearing housing.

grease are very rapidly removed from the bearing gap.It is, therefore, unnecessary to pack the bearing invacuo.

Fig.2 is a photograph of one design of the bearingdescribed above.

This extension, given here in outline, of the applica-tion of this type of bearing to straight-through shaftsopens up wide new prospects. It may be expected tofind many uses as a bearing for relatively high loadsand speeds or long life (more than 20000 hours). Forsuch conditions cheap sintered bearings (impregnatedbearings) are unsuitable, and the type of bearingdescribed here will render the use of compratively ex-pensive and bulky ball bearings is unnecessary. Furtheradvantages, such as the fact that grease-lubricatedbearings, like oil-lubricated bearings, are much quieterthan sintered or ball bearings, and the fact that theywithstand heavy thrust loads well, will, in our opiniongreatly encourage their use.

G. Remmers

G. Remmers is with Philips Research Laboratories, Eindhoven.

1966, No. 3/4 109

Recent scientific publications

These publications are contributed by staff of laboratories and plants which formpart of or co-operate with enterprises of the Philips group of companies, particularlyby staff of the following research laboratories:

Philips Research Laboratories, Eindhoven, Netherlands EMullard Research Laboratories, Redhill (Surrey), England MLaboratoires d'Electronique et de Physique Appliquée, Limeil-Brévannes

(S.O.), France LPhilips Zentrallaboratorium GmbH, Laboratory at Aachen, Weisshaus-

strasse, 51 Aachen, Germany APhilips Zentrallaboratorium GmbH, Laboratory at Hamburg, Vogt-

Kölln-Strasse 30, 2 Hamburg-Stellingen, Germany HMBLE Laboratoire de Recherche, 2 avenue Van Becelaere, Brussels 17

(Boitsfort), Belgium. B

Reprints of most of these publications will be available in the near future. Requestsfor reprints should be addressed to the respective laboratories (see the code letter) orto Philips Research Laboratories, Eindhoven, Netherlands.

W. Albers and H. J. Vlnk: De atomaire bouw van vrij-wel stechiometrische verbindingen.Chem. Weekblad 61, 61-69, 1965 (No. 6). E

P. Beekenkamp: The influence of the coordinationnumber of boron on the properties of alkali borateglasses.Physics of non-crystalline solids, Proc. int. Conf. Delft1964, pp. 512-524, North-Holland Publ. Co., Amster-dam 1965. . E

H. J. van den Berg: A new technique for obtaining thinlipid films separating two aqueous media.J. mol. BioI. 12, 290-291, 1965 (No. I). E

G. Blasse: On the octahedral radius of the trivalentcobalt ion.J. inorg. nuel. Chem. 27, 748-750, 1965 (No. 3). E

G. Blasse: Magnetic properties of mixed metal oxidescontaining trivalent cobalt.J. appl. Phys. 36, 879-883, 1965 (No. 31I). E

G. Blasse: Ferromagnetism and a new type of ferri-magnetism in oxygen spinels.Solid State Comm. 3, 67-69, 1965 (No. 4). E

G. Blasse: Influence of covalent bonding on somemagnetic properties of transition metal oxides.Bull. Soc. Chim. France, April 1965, 1212-1214. E

G. Blasse: New compounds with perovskite-like struc-tures.J. inorg. nuel. Chem. 27, 993-1003, 1965 (No. 5). E

G. Blasse: Some magnetic properties of mixed metaloxides with ordered perovskite structure.Philips Res. Repts. 20, 327-336, 1965 (No. 3). E

R. Bleekrode and W. C. Nieuwpoort: Chemical lasers,Il.Z. angew. Math. Phys. 16, 107-110, 1965 (No. I). E

R. Bleekrode and W. C. Nieuwpoort: Flame laser:model and some preliminary experimental results.Appl. Optics, Suppl. 2: Chemical lasers, pp. 179-180,1965. E

M. Borot: Luminescence par bombardement cathodi-que dans l'arséniure de gallium.Onde électr. 45, 1204-1215, 1965 (No. 463). L

C. J. Bouwkamp: An infinite product.Proc. Kon. Ned. Akad. Wet. A 68, 40-46, 1965 (No. I).

E

J. C. Brice: The angular dispersion of anisotropy inthin ferromagnetic films.Brit. J. appl. Phys. 16, 965-968, 1965 (No. 7). M

A. Bril, W. L. Wanmaker and C. D. J. C. de Laat:Fluorescent properties of red-emitting europium-acti-vated phosphors with cathode ray excitation.J. Electrochem. Soc. 112, 111-112, 1965 (No. I). E

P. H. Broerse: Camerabuizen.Ned. T. Natuurk. 30, 409-419, 1964 (No. 12). E

J. Burmeister: Kristallzüchtung inkongruent schmel-zender Verbindungen.Phys. Stat. sol. 10,223-226, 1965 (No. I). A

J. Burmeister: Schmelzen von Zinkoxyd durch Hoch-frequenzerhitzung.Phys. Stat. sol. 10, K 1 - K 2, 1965 (No. I). A

K. H. J. Buschow: Rare earth-aluminium intermetalliccompounds of the form RAl and R3Ah.J. less-common Met. 8, 209-212, 1965 (No. 3). E

K H. J. Buschow: The lanthanum-aluminium system.Philips Res. Repts. 20, 337-348, 1965 (No. 3). . E

110 PHILlPS TECHNICAL REVIEW VOLUME27

K. H. J. Buschowand J. H. N. van Vucht: Das SystemErbium-Aluminium und ein Vergleich mit dem SystemYttrium-Aluminium.Z. MetalIk. 56, 9-13, 1965 (No. I). E

G. Cayman: Laser action in an alloyed GaAs junction.Solid-State Electronics 8, 455-456, 1965 (No. 4). E

J. R. Chamberlain: The use of "fast" transitions inquantum counter applications..Physics Letters 16, 261-262, 1965 (No. 3). M

A. Claassen and L. Bastings: Potentiometric determi-nation of vanadium in iron and steel containing chro-mium and tungsten. .Z. anal. Chemie 202,. 241-250, 1964 (No. 4). E

L. J. Collins and J. Smith: Mirror mounts for experi-mental optical masers.J. sci. Instr. 42, 499-500, 1965 (No. 7). M

H. J. van Daal: Mobility of charge carriers in siliconcarbide.Thesis Amsterdam, Dec. 1964. E

K. Deneke: A remark on the semiconducting compound"AgFeTez" .J. appl. Phys. 36, 653, 1965 (No. 2). A

C. J. Dippel and H. Jonker: Ein neues Reproduktions-verfahren mittels Metallkeim-Introduktion.Reprographie, Ber. 1. int. Kongress für Reprographie,Cologne 1963,pp. 187-190, publ. Helwich, Darmstadt1964. E

J. A. W. van der Does de Bye: Temperature regulationby controlled injection of liquid nitrogen.Rev. sci. lnstr. 36, 104-105, 1965 (No. I). E

W. F. Druyvesteyn: Influence of a transport current onthe magnetization of superconducting indium-leadalloys.Physics Letters 14, 275-276, 1965 (No. 4). E

w. Elenbaas: The thermal-conduction loss in the high-pressure mercury-vapour discharge. .Philips Res. Repts. 20, 213-225, 1965 (No. 3).

G. Engelsma and G. Meijer: The influence of light ofdifferent spectral regions on the synthesis of phenoliccompounds in gherkin seedlings in relation to photo-morphogenesis, 1.Biosynthesis of phenolic compounds,11. Indoleacetic acid oxidase activity and growth., .Acta bot. need. 14, 54-72 and 73-92, 1965 (No. I). E

G. Frank: Das Gasgleichgewicht im System Germa-nium-Brom.Ber. Bunsenges. phys. Chemie 69, 119-124, 1965(No. 2).

A

P. Gerthsen and F. Kettel: Messung der Wärmeleit-fähigkeit von Gasen in rotierender Zylinderanordnung.Z. angew. Phys. 19, 378-380, 1965 (No: 4). A

J. A. Geurst: Calculation of high-frequency character-. istics of thin-film transistors.Solid-State Electronics 8, 88-90, 1965 (No. I). E

J. A. Geurst: Calculation of high-frequency charaç-teristics of field-effect transistors.Solid-State Electronics 8, 563-566, 1965 (No. 6). E

R. W. Gibson: Solid ultrasonic delay lines.Ultrasonics 3, 49-61, 1965 (April/June). M

A. H. Gomes de Mesquita: The structure of a siliconcarbide polytype 24R.Acta crystallogr. 18, 128, 1965 (No. I). E

A. H. Gomes de Mesquita, C. H. MacGilIavry and K.Eriks: The structure of triphenylmethyl perchlorateat 85°C.Acta crystall. 18,437-443, 1965 (No. 3). . E

C. Grenier and B. Elschner: Alternating-current lossesin Nb/Zr superconductive coils. .Philips Res. Repts. 20, 235-252, 1965 (No. 3).

H. L. Günther and G. Hötzl: DehnungsmeBstreifen ausSilizium.Z. Instrumentenk. 73, 13-14, 1965 (No. I). H

W. van Haeringen: Perturbation approach to the po-laron self-energy in the intermediate coupling range.Phys. Rev. 137, A 1902- A 1909, 1965 (No. 6A). E

J. Haisma: Gas lasers.Z. angew. Math. Phys. 16, 74-84, 1965 (No. I). E

P. A. H. Hart: The internal noise of a transverse waveelectron beam.Tubes pour hyperfréquences, Trav. 5e Congrès int.,Paris 1964, pp. 29-31. E

H. U. Harten: Die Grenzfläche Halbleiter-Elektrolyt.Festkörperprobleme Ill, 81-123, Vieweg, Brunswick1964. H

Y. Haven and B. Verkerke Diffusion and electricalconductivity of sodium ions in sodium silicate glasses.Phys. Chem. Glasses 6, 38-45, 1965 (No. 2). E

H.Henkes: Some remarks on a paper ofG.Kohlstrung.Phys. Stat. sol. 9, K 105- K 107, 1965 (No. 2).

F. N. Hooge: Injection lasers. .Z. angew. Math. Phys. 16, 89-97, 1965 (No. p. E

F. N, Hooge and T. Vrijheid-Lammers: The influenceof counterdoping on the distribution of mangenese oversubstitutional and interstitial sites in germanium.Philips Res. Repts. 20, 292-305, 1965 (No. 3). E

J. Ho~nstra: Dynamic properties of grain boundaries.Science of Ceramics 2 (Proc. Conf. Noordwijk aan Zee1963), 191-202, Academic Press, London 1965. E

1966,No. 3/4 RECENT SCIENTIFIC PUBLICATIONS III

H. Hoven and A. Stegherr: Über das Ätzen von Schlif-fen aus BizTe3-BhSe3- und Bi2Te3-Sb2Te3-Mischkri-stallen.Prakt. Metallogr. 2, 114-118, 1965 (No. 3). A

H. J. Hubers: Thermal stresses at glass-to-metal seals.Symp. on the contact of hot glass with metal, Scheve-ningen 1964, pp. 785-806.

H. J. Hubers: Contraintes dans les objets en verre etleur influence sur la résistance à la rupture.Silicates industr. 30, 25-35, 1965 (No. I).

B. B. van Iperen and H. J. C. A. Nunnink: The veloci-ty-modulated electron beam as a harmonics generatorfor millimeter and submillimeter waves.Tubes pour hyperfréquences, Trav. 5e Congrès int.,Paris 1964, pp. 124-129. E

G. H. Jonker, J. T. Klomp and Th. P. J. Botden: High-temperature seals on pure dense alumina.Science of Ceramics 2 (Proc. Conf. Noordwijk aan Zee1963),295-302, Academic Press, London 1965. E

L. Kapel and J. H. Kroon: Glass on metals and metallicoxides: wettability phenomena.Symp. on the contact of hot glass with metal, Scheve-ningen 1964, pp. 739-762.

A. van Katwijk: A grammar of Dutch number names.Found. Language 1, 51-58, 1965 (No. I). E

K. Klamer: Technologie van elektrokeramiek.Klei en Keramiek 15, 30-42, 1965 (No. 2).

S. R. de Kloet: Accumulation of RNA with a DNA-likebase composition in Saccharomyces carlsbergensis inthe presence of cycloheximide.Biochem. biophys. Res. Comm. 19, 582-586, 1965(No.5). E

E. Kooi: Influence of X-ray irradiations on the chargedistributions in metal-oxide-silicon structures.Philips Res. Repts. 20, 306-314, 1965 (No. 3). E

E. Kooi and M. M. J. Schuurmans: Temperature-gra-dient effects during heat treatments of oxidized silicon.Philips Res. Repts. 20, 315-319, 1965(No. 3). E

C. Kramer: A low-frequency pseudo-random noisegenerator.Electronic Engng. 37, 465-467,1965 (No. 449). E

J. Krugers and O. ReifenschweiIer: Activation analysis.Practical instrumental analysis, pp. 117-129, Elsevier,Amsterdam 1965. E

W. Kuypers and M. T. Vlaardingerbroek: Measurementof electron-beam noise.Philips Res. Repts. 20, 349-356, 1965(No. 3). E

W. Kwestroo and J. Visser: The ultrapurification ofhydrofluoric acid. .Analyst (J. Soc. Anal. Chem.) 90, 297-298, 1965 (No.IOO~. E

J. vanLaar and J. J. Scheer: Fermi level stabilization atsemiconductor surfaces.Surface Sci. 3, 189-201, 1965 (No. 2). E

H. de Lang: Optics in laser research.Z. angew. Math. Phys. 16, 7-14, 1965 (No. I). E

J. Liebertz and C. J. M. Rooymans: Die Ilmenit/Perowskit-Phasenumwandlung von CdTi03 unter ho-hem Druck.Z. phys. Chemie Neue Folge 44, 242-249, 1965 (No.3/4). A, E

B. Lopes Cardozo: Adjusting the method of adjust-ment: SD vs DL.J. Acoust. Soc. Amer. 37, 786-792, 1965 (No. 5). E

F. K. Lotgering: On the spontaneous magnetization ofMnFe204.Philips Res. Repts. 20, 320-326, 1965 (No. 3). E

G. Meijer and G. Engelsma: The synergistic influence ofa pre-irradiation on the photoinhibition of gherkinseedlings.Photochem. Photobiol. 4, 251-258, 1965 (No. 3). E

O. W. Memelink: De werking van halfgeleiderdiodenen transistoren.Ingenieur 77, E 15 - E 21, 1965 (No. 7). E

O. W. Memelink: De werking en eigenschappen van desilicium gestuurde gelijkrichter.Ingenieur 77, E 39 - E 42, 1965 (No. 11). E

B. J. Mulder: Photoconductivity spectra of stable andmetastable single-crystals of perylene.Rec. Trav. chim. Pays-Bas 84,713-728,1965 (No. 6). E

E. A. Muyderman: Construeren met spiraallagers.Polytechn. T. A 20, 154A - 166A, 1965 (No. 4). E

J. Neirynck and Ph. van Bastelaer: Catalogue of step-responses of narrow-band FM systems.Rev. MBLE 8,98-109, 1965 (No. 2). . B

A. G. van Nie: Grundlagen der Mikrowellenbündel-Technik.Nachrichtentechn. Z. 18, 17-21, 1965 (No. I). E

A. K. Niessen and F. A. Staas: Hall effect measurementson type II superconductors.Physics Letters 15, 26-28, 1965 (No. I). E

A. K. Niessen, J. van Suchtelen, F. A. Staas and W. F.Druyvesteyn: Guided motion of vortices and aniso-tropic resistivity in type-II superconductors.Philips Res. Repts. 20, 226~234, 1965 (No. 3). E

W. C. Nieuwpoort and R. Bleekrode: Chemicaliasers, I.Z. angew. Math. Phys. 16, 101-106, 1965 (No. I). E

112 PHILIPS TECHNICAL REVIEW VOLUMK27

J. Ober: The large-signal behaviour of a travelling-wave tube with an attenuating central helix section.Philips Res. Repts. 20, 357-376, 1965 (No. 3). E

D. J. van Ooijen: Flux quantization noise on hollowsuperconducting cylinders.Physics Letters 14, 95-97, 1965 (No. 2). E

W. P. Osmond: The magnetic structure of spinels con-taining paramagnetic octahedral cations but diamag-netic tetrahedral cations.Proc. Phys. Soc. 85, 1191-1196, 1965(No. 6). M

G. J. Oudemans: Compaction of dry ceramic powders.Science of Ceramics 2 (Proc. Conf. Noordwijk aan Zee1963), 133-146, Academic Press, London 1965. E

F. E. Roberts: High temperature Hall meàsurements onGaAs.Physics Letters 17, 21-22, 1965 (No. I). M

J. G. van Santen and A. J. F. de Beer: A digital volt-meter with a photoconductive potentiometer.Solid-State Electronics 8, 7-12, 1965 (No. I). E

D. A. Schreuder: Contrast sensitivity in test field withbright surround.J. Opt. Soc. Amer. 55, 729-731; 1965 (No. 6).

M. S. Seltzer: Diffusion of manganese into galliumarsenide.J. Phys. Chem. Solids 26, 243-250, 1965 (No. 2). E

P. J. W. Severin: The interaction of microwaves withthe cathode fall and negative glow in a glow discharge.Thesis Utrecht, Oct. 1964. E

A. L. Stuijts and C. Kooy: Influence of technologicalfactors on the sintering behaviour of a ferrite.Science ofCeramics 2 (Proc. Conf. Noordwijk aan Zee1963),231-242, Academic Press, London 1965. E

A. L. Stuijts, J. Verweel and H. P. Peloschek: Denseferrites and their applications.IEEE Trans. on communication and electronics 83,726-736, 1964 (No. 75). E

K. Teer: On the optimum configuration for a condensermicrophone.Acustica 15, 256-263, 1965 (No. 5). E

G. W. Tichelaar: Brosse breuk van ongelegeerd las-. metaal bij lage temperaturen.Lassymposium 1964,pp. 31-41, and Discussies van hetLassymposium 1964,pp. 23-28, publ. Wyt, Rotterdam.

E

D. R. Tilley: Critical fields and flux penetration patternin anisotropic type II superconductors.Proc. Phys. Soc. 85, 1177-1184, 1965 (No. 6). M

H. J. L. Trap: Electric properties of some aluminobo-rate glasses.Physics of non-crystalline solids, Proc. int. Conf. Delft1964, pp. 635-645,North-Holland Publ. Co., Amster-dam 1965. E

J. van der Veen: A simple method for the preparationof some methylphenylsulfonium nitrates.Rec. Trav. chim. Pays-Bas 84, 540-544, 1965 (No. 4).

E

M. L. Verheijke: Efficiencies of a coincidence spectro-meter for positron annihilation radiation.Nucl. Instr. Meth. 34, 132-136, 1965 (No. I). E

A. G. van Vijfeijken and A. K. Niessen: Longitudinaland transverse voltages in superconductors.Physics Letters 16, 23-24, 1965 (No. I). E

H. J. Vink: Bouwen opbouw van vaste anorganischestoffen.Chem. Weekblad 61, 1-11, 1965 (No. I). E

J. Volger: The generation of heavy currents in super-conducting circuits.International Advances in Cryogenic Engineering (part2 of Adv. Cryog. Engng. 10), PP: 98-104, 1965. E

K. Walther: Dispersion of a step-modulated carrierwave in a waveguide. .Proc. IEEE 53, 410, 1965 (No. 4). H

W. L. Wanmaker and M. G. A. Tak: The retention ofcopper and bromide in electroluminescent ZnS :Cu,Brphosphors.Philips Res. Repts. 20, 278-291, 1965 (No. 3).

J. van deWaterbeemd : Kinetics of growth and structureof thin films of tin.Physics Letters 16, 97-98, 1965 (No. 2). E

C. Weber: Calculation of electron guns taking intoaccount space charge and thermal velocities.Tubes pour hyperfréquences, Trav. Se Congrès int.,Paris 1964, pp. 47-49. E

K. R. U. Weimer, H. Bodt and M. T. Vlaardingerbroek:Interaction of an electron beam plasma system withslow-wave structures.Tubes pour hyperfréquences, Trav. 5e Congrès int.,Paris 1964, pp. 465-468. E

G. A. Wesselink and A. Bril: Fluorescent properties oftrivalent neodymium in lanthanum and yttrium ortho-niobates and tantalates .Philips Res. Repts. 20, 269-277, 1965 (No. 3). E

P. C. van der Willigen: De ontwikkeling van het C02-lassen van staal.Metalen e.a. Constr.mat. 20, 62-71, 1965 (No. 3). E

G. Zanmarchi: Absorption of light near the band edgein a-SiC 24R.Philips Res. Repts. 20, 253-268, 1965 (No. 3). E

H. Zimmer: Field emission at 9000 Mcjs in a supercon-ducting cavity. .Electronics Letters 1, 24,1965 (No. I). H

Volume 27, 1966, No: 3/4 Published 26th August 1966pages 69-112