SAVOY PLACE, VICTORIA EMBANKMENT, LONDON, W.C. 2.

VOL. 61, 1923.

E. AND F. N. SPON, LIMITED, 57, HAYMARKET, LONDON, S.W. 1
SPON AND CHAMBERLAIN, 123, LIBERTY STREET, NEW YORK

1923

VICTORIA EMBANKMENT, LONDON, W.C. 2.

FOUNDED 1871.

INCORPORATED BY ROYAL CHARTER 1921.

Patron: HIS MAJESTY KING GEORGE V

COUNCIL, 1922-1923.

President.

F. GILL, O.B.E.

Past-Presidents.

ALEXANDER SIEMENS.-1894 & 1904.

COLONEL R. E. CROMPTON, C.B.-1895 & 1908.
SIR HENRY MANCE, LL.D., C.I.E.— 1897.
JAMES SWINBURNE, F.R.S.-1902.

SIR R. T. GLAZEBROOK, K.C.B., D.Sc., F.R.S.-1906.
W. M. MORDEY.—1908.

Dr. S. Z. DE FERRANTI.—1910 & 1911.
SIR JOHN SNELL.-1914.

CHARLES P. SPARKS, C.B.E.-1915 & 1916.
C. H. WORDINGHAM, C.B.E.-1917 & 1918.
ROGER T. SMITH.-1919.

LL. B. ATKINSON.—1920.

J. S. HIGHFIELD.-1921.

The Institution is not, as a body, responsible for the opinions expressed by individual
authors or speakers.

PAGE

PAGE

"The Drive of Power Station Auxiliaries." By L.

Breach and H. Midgley, B.Sc. (Eng.)

829

Discussion:

Before the Institution

845

851

858

"The Compound Characteristic in Regenerative Braking

with Direct-Current Traction." By M. G. Say,

M.Sc., and H. G. Frampton

"The Application of a Revolving Magnetic Drum to

Electric Relays, Siphon

Siphon Recorders and Radio

Transmitting Keys." By N.

By N. W. McLachlan,

863

"The Calculation of Air-Space Flux." By Professor

W. Cramp, D.Sc., and Nora I. Calderwood, M.A.,

B.Sc.

1061

"The Leakage Flux between Parallel Pole-Cores of

Circular Cross-Section." By B. Hague, M.Sc. .. 1072

"The Effect of Shearing Stress on the Span Calculations

of a Suspended Cable." By Professor T. Ohtsuki 1079

"The Nature of the Magnetic Field produced by the

Stator of a Three-Phase Induction Motor, with

special reference to Pole-Changing Motors." By

F. J. Teago

“Wind-driven Generators." By W. Stirling .

1087

1096

D.Sc. (Eng.)

903

Discussion before the Wireless Section

926

"The Design of Inductances for High-Frequency Cir-

cuits."

By Professor C. L. Fortescue

933

949

"Report upon Tests on Hard Drawn Copper Wires and
Cables for Overhead Transmission Lines "
"Report upon Tests on Hard Drawn Aluminium Wires
and Cables for Overhead Transmission Lines " . 1013
"Report upon Tests on Galvanized Steel Wires and
Cables for Overhead Transmission Lines
"Report upon Tests on Steel-Cored Aluminium Cables
for Overhead Transmission Lines"
"Electric Line Calculations: their Practical Applica-
tion to Transmission and Distribution Problems."
By W. T. J. Atkins, B.Sc. (Eng.)
"Wireless Direction-Finding in Steel Ships." By C. E.
Horton ..

Page 247, col. 2, line 50: For "£0.2" read "£0.1."

Pages 517-579. Corrections to the paper on 'Permissible Current Loading of British
Standard Impregnated Paper-Insulated Electric Cables" will be found on page 948.

Page 702, col. 1, ninth line from bottom: For 15 15 0" read