274   INDEX

Deviations of magnetic compass, 166, Gyro-compass, Florentia, 247-253

168   meridian-seeking tendency of, 173

Directed gun-fire control, 128   181

Directorscopes, gun-fire, 129   Sperry, 198-214

Drift of projectiles, 80   Gyro-compass is subject to errors,

Dynamic stability, defined, 255   182-196

some laws of, 257   Gyrodynamics, first and second laws

Dyne, 2   of, 55

Gyro-horizontals, 115-128

E   Gyro-pendulum, 105

Earth inductor compass, 169   of the same period as a certain

Earth's axis and spin-axis of gyro-   simple pendulum, 113

scope, 71-74   Gyroscope modifies rolling of a ship,

Energy, 2   140

of precessing body, 66   Gyroscopic conical pendulum, 105

Erg, 2   108

Errors to which a gyro-compass is Gyroscopic torque or resistance, 49

subject, 182-196   Gyro-verticals, 115

F   H

Fieux   Horizon, Sperry airplane, 78

ship stabilizer, 144   Horizontals, dynamic and true, 12,13

Fleuriais gyroscopic octant, 120   Horse-power, 3

Florentia gyro-compass, 247-253   Hurrying s   d retarding

Follow-up repeater system of An_   an   g precession, 69 schhtz gyro-compass, 234

of Arma gyro-compass, 238   I

of Brown gyro-compass, 221   Inclinometer, Bonneau's, 76

of Florentia gyro-compass, 248   Inductor compass, 169

of Sperry gyro-compass, 202   Inertia, 3

Force, 2, 5   moment of, 4, 13-15

centripetal and centrifugal, 12, 16   Intercardinal error, of gyro-com

Frahm anti-roll tanks, 42   passes, 191

Freedom, degrees of, 44   suppression of, 195, 212, 222, 232,

Friction at peg of top causes rise of   247, 252 spin-axis, 76

K

G

Kinetic energy of a precessing body,

Gimbals, 45   66

Griffin pulverizing mill, 92   Kinetic stability, defined, 255

Gun-fire control, 128   of monorail cars, 259-272

Gun-fire control compasses, 196   some laws of, 257 Gun-fire control directorscope, 129

Gyration, radius of, 14   L

Gyro, gyroscope, gyrostat, defined, 45

Gyro-compass, Anschutz, 224-235   Latitude, determination of, 115

Arma, 236-247   Latitude error of gyro-compasses,

Brown, 215-223   182,205

INDEX   275

Latitude error of gyro-compasses, North-steaming error, Arma, 241

avoided, 220, 231, 241   Brown, 220

corrected, 206, 251   Florentia, 251

Leavitt torpedo steering gear, 97   Sperry, 206 Locomotive, gyroscope couple acting Nutation, 67

on, 63-66

M   0

Magnetic compass, deviations, pro- Octant, Fleuriais gyroscopic, 120

duced by a rapid turn, 168

when on an iron ship, 166   P

directive tendency of, 165   Pendulous gyroscope, 105

Magneto compass, 169   meridian-seeking tendency of, 173

Mass, 3   period of, 108-111

Maxwell top, 10   Pendulous mass, 191

Meridian, magnetic, 162   Pendulum, conical, 29

Meridian method of locating the   forces acting on an unsymmetrical,

geographic, 162   16

Meridian-seeking tendency, of a liq-   mathematical or simple, 29

uid-controlled gyroscope, 176   physical, 28

of a magnetic compass, 165   with attached gyroscope, 136, 146

of a pendulous gyroscope, 173   Period, of a conical pendulum, 30

Meridian-seeking torque acting on a   of a gyro-compass, 186-190

gyro-compass, 178   of a mathematical and of a physical

Meridian-steaming error, of gyro-   pendulum, 29

compasses, 182   of simple harmonic motion of rota

Anschutz, 231   tion, 25

Arma, 241   of the roll of a ship, 134

Brown, 220   Phase and phase angle, 32

Florentia, 251   Pioneer turn indicator, 85

Sperry, 206   Pitching of a ship due to waves, 132

Metacentric height, 132   Port side of a ship, defined, 50

Moments of inertia, 4, 13, 15   Power, 2

dynamic, 14   Precessing body, kinetic energy of, 66

principal, 15 Precession, 48 Momentum, angular, 5, 10, 17, 20 period of, 66 Monorail cars, gyroscopic stabiliza- Precessional torque, 49

tion of, 257-272   Precessional velocity maintained by a

Brennan, 268   torque, 55

Scherl, 271   Projectile, drift of a, 80

Schilovsky, 266

Motorcycle, gyroscopic forces acting

on a, 57   Q

Quadrantal deflection, 191, 195

N   Quadrantal error, avoided, in the

North-steaming error, of gyro-com-   Anschutz gyro-compass, 232

passes, 182   in the Arma gyro-compass, 247

AnschUtz, 231   in the Brown gyro-compass, 222