Front MatterSource: Philosophical Transactions of the Royal Society of London. Series A, Containing Papersof a Mathematical or Physical Character, Vol. 214 (1914), pp. i-viiiPublished by: The Royal SocietyStable URL: http://www.jstor.org/stable/91012 .

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P I L 0 S 0 P 1-1- I C A L

OF THE

ROYAL SOCIETY OF LONI)OI N

SERIES A.

CONTAINING PAPERS OF A MATHEMATICAL OR PHYSICAL CHARACTER.

v 0 LA. 214.

LONDON:

PRINTED BY HARRISON AND SONS, ST. MARTIN'S LANE, W. .,

1rintfrs in @r1inua to j? te.

D)ECEMBER, 191i4.

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[ iii I

CONTENTS.

(A)

VOL. 214.

List of Illustrations .page v Errata .vi Advertisement .vii

I. The Preparation of Eye-preserving Glass for Spectacles. By Sir WILLIAM

(CROOKES, 0.L, FR.S..c.ye 1

II. Absolute Measurements of a R[esistance by a Method based on that of LORENZ.

By F. E. SMITH, A.R. (.Sc. (From the National I'hysical Laboratory.) C(ontmunicated by R. T. GLAZEBROOK, M/.A., F.R.S. . . e . . . 27

III. The Influence of Molecular Constitution and Temperature on Magnetic Susceptibility. By A. E. OXLEY, B.A., M.Sc., Coutts Trotter Student, Trinity College, C~3ambridge. Communicated by Prof .Sir J. J. THOMSON,

O.M., F.R.S. 109

IV. A Determination of the Electromotive F'orce of the Weston Normal Cell in Semri-absolute Volts. By A. NORMAN SHAW, M.Sc., 1851 Exhibitioner 7, and King Research Fellow, McGill University, Montreal. With a Preface by Prof. H. L. CALLENDAR, F.R.S. Communicated by Prof. I. L. CALLENDNAR,

F.R.S. 147

V. Similarity of Motion in Relation to the Surface F riction of Fluids. By T. E. STANTON and J. IR. PANNELL. Qommunicated by Dr. R-. T. GLAZ:EBIROOK,

F.R.S. (Fromn the Nactiontal Physical Laboraxtory). ......199 a 2

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[ iv ]

VI. BAKERIAN LECTURE.-SerieS Lines in Spark Spectra. By A. FOWLER, F.R.S., Assistant Professor of Physies, I'mperial collegee, South Kensington pagqe 225

VII. Dilute Solutions of Alumnrium in- Gold. By C. T. HEYCOCK, F.R.S., and F. H. NEVILLE, F.R.S. (From the Goldsmiths Metallurgical Laboratory, University of Cambridge) .267

VIII. On the Origin of the Electron Emission front Glowling Solids. By FRANK

HORTON, Sc. D. Communicated by Prof Sir J. J. THOMSON, O.M.,

F.R.S... . 277

IX. On the Lunar Diurnal Variation of the Earth's Magnetism at Pavlovsk and Pola (1897-1903). By S. CHAPMAN, B.A., D.Sc., Fellow of Trinity College, C(ambridge, and C6hief Assistant at the Royal Observatory, Greenwich. Cotnmunicated by the Astronomer Royal, F.R.S. 295

X. The Capacity for Heat of Metals at Low Temperatures. By E. H. GRIFFITHS,

Sc.D., F.R.S., and EzER TGRIFFITHS, I.SC., Fellow of the University of WVales .*319

XI. The Spark Spectwr1um of Nickel under moderate Pressures. By E. G. BILHAM,

A.R'.C.Sc., B.Sc., D.I.C., Research Student at the lnmperial College of Science

and Technology. Communicated by A. FOWLER, F.R.S.359

XII. On the Convection of' Heat rom Smiall C(ylinders in a Stream of FP'luid: Determination of the convectionn Constants of Small Platinum - Wires with

Applications to IHot- Wire Anemomtletry. By Louis VESSOT KING, B.A. (Cantab.), Assistant Professor of Physics, McGill University, Montreal.

Communicated by Prof: HOWARD T. BARNES, FTIJ. . .S373

XIII. On Acquired Radio-Activity. By Sir WILLIAM CROOKES, O.M., LL. D., D.Sc., Pres.R.S. 433

Index to Volumne ........ . . 447

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v]

LIST OF ILLUSTRATIONS.

Plates 1 and 2.-Mr. A. NORMAN SHAW on a Determination of the Electromotive Force of the Weston Normal Cell in Semi-absolute Volts.

Plate 3.-Prof. A. FOWLER. BAKERIAN LECTURE.-Series Lines in Spark Spectra.

Plates 4 and 5.-Messrs. C. T. HEYCOCK and F. H. NEVILLE on' Dilute Solutions of Aluminium in Gold.

Plates 6 and 7.-Mr. E. G. BILHAM on the S-park Spectrum of Nickel under Moderate Pressures.

Plate 8.-Prof. Louis VESSOT KING on the Convection of Heat from Small Cylinders in a Stream of Fluid: Determination of the Convection Constants of Small Platinum Wires with Applications to Hot-Wire Anemometry.

Plates 9 and 10.-Sir WILLIAM CROOKES on Acquired Radio-Activity.

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[ vi]

ERRATA.

Page 257:

Futor - 082772E2e2Mm 27r2E2ge2Mm read c3( 9h ch" (M+in' ch (M-Ln)

Page 258: , 16 (M+m) a 16 (M+m)

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r vii :

ADVE RT ISEMENTo

THrE Committee appointed by the Royal Soc ety to direct the publication of the

P1hiloso hical Trsaetions Pake this opportunity to acquaint the public that it fully

appears, as well from the Council-books and Journals of the Society as from repeated

declarations which have been made in several former Transactions, that the printing of

them was always, from time to time, the single act of the respective Secretaries till

the Forty-seventh Volume; the Society, as a Body, never interesting themselves any

further in their publication than by occasionally recommending the revival of them to

some of their Secretaries, when, from the particular circumstances of their affairs, the

Transaction s had happened for any length of time to be intermitted. And this seems

principally to have been done with a view to satisfy the public that their usual

meetings were then continued, for the improvement of knowledge and benefit of

mankind: the great ends of their first institution by the Royal Charters, and which

they have ever since steadily pursued.

But the Society being of late years greatly enlarged, and their communications more

numerous, it was thought advisable that a Committee of their members should be

appointed to reconsider the papers read before them, and select out of them such as

they should judge most proper for publication in the future Transactions; which was

accordingly done upon the 26th of March, 1752. And the grounds of their choice are,

and will continue to be, the importance and singularity of the subjects, or the

advantageous manner of treating them: without pretending to answer for the

certainty of the facts, or propriety of the reasonings contained in the several papers

so published, which must still rest on the credit or judgment of their respective

authors.

It is likewise necessary on this occasion to remark, that it is an established. rule of

the Society, to which they will always adhere, never to give their~ opinion, as a Body,

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[ viii g

upon any subject, either of Nature or Art, that comes before them. And therefore the

thanks, which are frequently proposed from the Chair, to be given to the authors of

such papers as are read at their accustomed meetings, or to the persons through whose

hands they received them, are to be considered in no other light than as a matter of

civility, in return for the respect shown to the Society by those communications. The

like also is to be said with regard to the several projects, inventions, and curiosities of

various kinds, which are often exhibited to the Society; the authors whereof, or those

who exhibit them, frequently take the liberty to report, and even to certify in, the

public newspapers, that they have met with the highest applause and approbation.

And therefore it is hoped that no regard will hereafter be paid to such reports and

public notices; which in some instances have been too lightly credited, to the

dishonour of the Society.

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