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Great Northern Cascade Tunnel, power station.... XXVIII (09) 1292

system, description. .... XXVIII (09) 1281
system, efficiency...... XXVIII (09) 1313
system, locomotive, de-

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system, overhead struc-

ture, description.. XXVIII (09) 1337

Grosse-Lichterfelde experimental railway, description....XVIII (01) 108

three-phase railway, tests..

Ground, arcing, detection with oscillograph.

effect of series inductance.

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making

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resistance, effect of salt, tests..

XXVII (08) 715

tests under various con-

ditions

XXVII (08) 710

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XXII (03) 423

.. XXVI (07) 1213

pipe, permanence of conductance..

relation between depth and conductance... XXVI (07) 1215
resistance, experimental investigation.. ..XXVI (07) 1209
tests under various conditions.. XXVI (07) 1219

specification

plates, copper, resistance tests...

.XXVII (08) 726
.XXVI (07) 1217

resistance tests under various conditions.. XXVI (07) 1219
resistance variation with moisture, tests. ....... XXVI (07) 1210
temperature, tests.... XXVI (07) 1210

rod (see Lightning rod).

shield for transformers..

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(08) 429, 449; XXIX (10) 598, 607, 613, 614

energy loss due to inductance..

equipotential lines about..

XXII (03) 337

.XXVI (07) 875

experience....
......... XXII (03) 370; XXVI (07) 888; XXVII

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transformer insulation..

.XXIII (04) 350

.XXVIII (09) 1195
XXII (03) 386

experience, Chicago Edison Co..... .XXVI (07) 1611
Int. Rapid Transit Co......xXVI (07) 1605
transmission line..... .XXVI (07) 1635

method of connecting parallel operated

star-connected generators

objections

potential strains

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effect

size

resistance used by Chicago Edison Co... XXVI (07) 1613

series resistor, design.

use of ground as return.

.XXVI (07) 1606

.XXVI (07) 1592

XXVI (07) 1600

.XXVI (07) 1588

value of resistance used by Int. Rapid

XXVI (07) 1606

XXVI (07) 1239

.XIX (02) 166

.xxv (06) 819

Transit Co.

Group drive (see Motors, applications).

switch (see Switches).

Guanajuato transmission line, construction data.....

Gyration, radius of wheels.

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.XXVI (07) 959
....XXVI (07) 958

Harbor defense, account of work done by Volunteer Elec-

trical Corps in Boston..

Harmonic quantities, vector representation.

Harmonics, artificial, sources in cable system.

effect of grounded neutral...

star-connected generator..

transformer connections..

.XIX (02) 727
XXIX (10) 1242
XXVIII (09) 835
....xxv (06) 702
..xxv (06) 704
.xxv (06) 700

even, production in commercial circuits.. XXVIII (09) 727, 733
in transformers, interconnected, explanation. .XXIX (10) 900
observation..xxIx (10) 853

currents and e. m. f's., tests. .XXIX (10) 809
observed during service.....XXIX (10) 873
polyphase, observation. ......XXIX (10) 865

triple, in interconnected neutral of star-

connected generators, measurement. .XXIX (10) 781

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spectrophotometric analysis, different
total flux, determination..

Heat dissipated from wires, experiments.

types... XXIX (10) 1069

.XXIX (10) 1063

.XXVIII (09) 363

storage of electric energy........ XXVII (08) 1600; XXIX (10) 678
Heater, electric, hot-water, cost compared with

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equivalent

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wires under various conditions of cooling.
Heaviside's method of explaining wave motion...
Hefner lamps (see Lamps).

XXVIII (09) 533

XXVIII (09)

531

XXVIII (09) 539

...... XXIX (10) 121
XXVII (08) 1607, 1609

......

XXVI (07) 969
.XXVII (08) 1312

Heraeus wire temperature coefficient of resistivity.
Hering's flux unlinking experiment..

laws for electrode losses..

Hewlett link insulator, construction.

description

Heyland diagram for single-phase motor, derivation..
Hickley electrolytic rectifier for telegraph work..
High-tension committee report on standard line

struction

.....

Hoe printing press, motor drive.

Hoists (see Hoisting).

acceleration, calculation

coal, acceleration curves, observed.

power requirements

Ward Leonard system, disadvantages.
conical-drum, load diagrams..

calculation

....xxv (06) 485
XXVII (08) 1343
.XXIX (10) 465, 492

.XXVI (07) 1261
.XXVI (07) 1259
XXIII (04) 435, 440
XXIX (10) 1315

con-

static moment, variation, calcula-

tion

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cylindrical-drum, load diagrams.

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XXIX (10) 304

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electric, Ilgner system compared with steam tests. XXIX (10) 331

induction motor, characteristics.

motor power, calculation...

rating, determination

friction torque, calculation...

log, typical

mine, acceleration, choice..

balancing system, requirements..

electric, balancing system, characteristics.
Koepe, load diagram, calculation..
load curve

diagrams, calculation

motors, choice of control.

power requirements

Whiting, load diagram, calculation.

reel, load diagram

calculation

retardation, calculation

steam, coal-to-rock ratio, tests..

.XXIX (10) 313
..XXIX (10) 298
.xxv (06) 152
.XXIX (10) 295
. XXII (03) 558
. XXII (03) 555
.XXIX (10) 298
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.XXIX (10) 307
.XXIX (10) 295

.XXIX (10) 332

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.XXIX (10) 331

service tests

.XXIX (10) 331

Ward Leonard system, connection diagram.

service tests

Hoisting, electric, motor rating, determination.

mine, balancing system, requirements.
converter system, description..

electric, advantages ..

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balancing system, characteristics. XXIX (10) 313
characteristics, d.c. motor, motor-

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economy, estimated

.XXIX (10) 319

Ilgner system

......

flywheel-motor-generator set, use. XXIX (10) 275

compared with

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Homopolar generators (see Generators, acyclic).

Horn-gap arrester (see Lightning arresters).

.XXIX (10) 332

XXIX (10) 287
XXIX (10) 331
XXIX (10) 283

Hospitalier ondograph, description..

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Hot water electric heating (see Heating).

Hot-wire comparator (see Comparator).

Housatonic river, minimum flow..

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Houston and Kennelly luminometer (see Luminometer).

Huber system of current collection (see Current collectors).

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tests, light and heavy flywheels. .... XXIII (04) 354

effect of flywheel upon engine governor....... XXIII (04) 357

natural period of engine-generator unit,

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.XXIII (04) 360

.XVIII (01) 786

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