272   GYROSCOPIC STABILIZATION

of the car is endangered, a magnetic device releases a set of supports that will hold the car upright.*

When the car tilts to one side, the gyro spin-axles precess toward one another; when the car tilts to the other side the spin-axles precess away from one another. In either case, the tilting of the spin-axles operates valves which control the operation of the hydraulic precession motor piston. The movement of this piston accelerates the precessional velocity of the two connected gyros. The result is a torque which tilts the car upward and, possibly, past the vertical position.

* U. S. Patent. Scherl, No. 959077, 1910.

I

INDEX
(The numbers refer to pages)
A   C

Acceleration, angular, 4, 10   Camera control on an airplane, 101

linear, 1, 7   104

radial, 2   Cardan suspension, 45

relation between angular and linear, Carter's track recorder, 125

11   Cartography, airplane, 100

Agonic line, 165   Center of gravity, 21 Airplane, gyroscopic actions on, 51, Center of mass, 21

59   Centrifugal drier, Weston's, 75

Airplane cartography, 100   Centripetal and centrifugal forces,

Airplane gyroscopic pilot, 123   12, 16

Angular momenta, 5, 10, 17, 20   Centroid, 21

Anschutz gyro-compass, 224-235   Clinging of spinning body to guide, 85

Anschutz gyro-horizon, 117   Clinograph for measuring crooked

Anti-roll devices for ships, 42, 131-   ness of well casings, 74

161   Compass, gyroscopic, 162

Arma gyro-compass, 236-247   inductor, 169

Autogiro, 52   magnetic, 165

magneto, 169

sun, 170

B   Couple, force, 4

Coupled systems, 36

Ballistic damping or turning error, Course and speed errors of gyro

190   compasses, 182

Ballistic damping or turning elimina-   avoided, in Anschutz compass, 231

tor, 212, 246   in Arma compass, 241

Ballistic deflection error, 184, 186   in Brown compass, 220

avoided, 210, 222, 231, 244, 252   in Florentia compass, 251

Beats, 38   in Sperry compass, 206 Bessemer's steamer *ith gyroscope,

62

Bliss-Leavitt torpedo stearing gear,   D

97

Bonneau airplane inclinometer, 76   Damping of vibrations, 39

Bonneau-LePrieur-Derrien gyro-sex-   in Anschutz gyro-compass, 228

tant, 119   in Arma gyro-compass, 237

Brennan monorail cars of 1905 and   in Brown gyro-compass, 218

1916, 268   in Florentia gyro-compass, 250

Brown gyro-compass, 170   in Sperry gyro-compass, 203

Bumstead sun compass, 170   Degrees of freedom, 44

273