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OF THE
PHYSICAL SOCIETY OF LONDON.
From January 1879 to July 1880.
VOL. III.
LONDON:
PRINTED BY TAYLOR AND FRANCIS,
RED LION COURT, FLEET STREET.
MDCCCLXXX,
CONTENTS.
Page
Starch and Unannealed Glass under the Polariscope. By
Walter Baily. (Plates I.-IV.). . . . .
1
An easy Method for Adjusting the Collimator of a Spectro-
scope. By Arthur Schuster, Ph.D., F.R.A.S..
14
A Condenser of Variable Capacity, and a Total-Reflexion Expe-
riment. By C. V. Boys, A.R.S.M., Lecturer for the Term on
Natural Science at Uppingham School
On the Music of Colour and Visible Motion. By Professors
John Perry and W. E. Ayrton (Plates V. & VI.)
On the Determination of the Variation of the Thermal Conduc-
tivity of Metals with Temperature, by means of the perma-
nent Curve of Temperature along a uniform thin Rod heated
at one end. By Oliver J. Lodge, D.Sc., Lecturer on Applied
Mathematics and Mechanics at University College, London.
(Plate VII.)
.....
On the Photographic Method of Registering Absorption-Spectra,
and its Application to Solar Physics. By Capt. W. de W.
Abney, R.E., F.R.S.
17
18
28
43
On Spectra of Lightning. By Arthur Schuster, Ph.D., F.R.A.S. 46
On the Transmission and Distribution of Energy by the Electric
By C. William Siemens, D.C.L., F.R.S. (Plate
Current.
VIII.)
52
A new Theory of Terrestrial Magnetism. By Professors John
Perry and W. E. Ayrton
57
The Maintenance of Constant Pressures and Temperatures. By
Frederick D. Brown, B.Sc. (Plate IX.)
68
On the Fracture of Colloids. By Frederick Guthrie. (Plates
X. & XI.)
76
Induction-balance and Experimental Researches therewith. By
Prof. D. E. Hughes. (Plate XII.)
Note on the Examination of certain Alloys by the Aid of the
Induction-balance. By W. Chandler Roberts, F.R.S., Chemist
of the Mint. (Plate XIII.)
On Professors Ayrton and Perry's new Theory of the Earth's
Magnetism, with a Note on a new Theory of the Aurora. By
H. A. Rowland, Professor of Physics in the Johns Hopkins
University
81
89
93
Notes from the Physical Laboratory of University College,
Bristol. By Prof. Silvanus P. Thompson, B.A., D.Sc.
The Distribution of Heat in the Visible Spectrum. By Sir
John Conroy, Bart., M.A.
98
106
Measuring Polariscopes. By Professor W. Grylls Adams, M.A.,
F.R.S. (Plate XIV.)
112
A Mode of producing Arago's Rotation. By Walter Baily, M.A.
(Plates XV. & XVI.)...
115
On the Conjugate Positions of two Circular Coils of Wire. By
W. Grant, Assistant in the Physical Laboratory, University
College, London. (Plate XVII.)
121
On Magneto-Electric Induction.
By Frederick Guthrie and
C. V. Boys, Assoc. R. School of Mines.-Part I. (Plate
XVIII.)..
127
at one end. (Second Paper.) By Oliver J. Lodge, D.Sc.,
Assistant Professor of Physics in University College, London 141
On an Analogy between the Conductivity for Heat and the
Induction-Balance Effect of Copper-Tin Alloys. By W.
Chandler Roberts, F.R.S.
156
Note on a Determination of the Specific Electrical Resistance
of certain Copper-Tin Alloys. By Oliver J. Lodge, D.Sc... 158
On a Suggestion as to the Constitution of Chlorine, offered by
the Dynamical Theory of Gases. By A. W. Rücker, M.A.,
Professor of Physics in the Yorkshire College, Leeds
On the Graduation of the Sonometer. By J. H. Poynting,
M.A., Fellow of Trinity College, Cambridge....
163
169
On a new Form of Resistance-Balance adapted for comparing
Standard Coils. By J. A. Fleming, D.Sc. (Univ. Lond.),
Scholar of St. John's College, Cambridge. (Plate XIX.) .. 174
A Dispersion-Photometer.
W. E. Ayrton...
By Professors John Perry and
On Intermittent Currents and the Theory of the Induction-
balance. By Oliver J. Lodge, D.Sc., Assistant Professor of
Physics in University College, London....
On the Determination of Chemical Affinity in terms of Elec-
tromotive Force.-PART I. By C. R. Alder Wright, D.Sc.
London, Lecturer on Chemistry and Physics in St. Mary's
Hospital Medical School.....
184
187
213
PART II.-By Dr. C. R. Alder Wright and E. H. Rennie, M.A.
(Syd.), B.Sc. (Lond.), Demonstrator of Chemistry in St.
Mary's Hospital Medical School
246
Determination of the Acceleration of Gravity for Tokio, Japan.
By Professors W. E. Ayrton and John Perry
265
On Induction in Telephonic Circuits. By W. Grant
276
[At end of Volume.]
Proceedings at the Meetings, and Report of the President and
Council for the Session 1878-79.
Council for the Session 1879-80.