INDEX
Reading edition
Absence of latitude error in Anschütz (1912) compass, 158
Absence of latitude error in Brown compass, 66
Action of excentric pin in Sperry compass, 55 et seq.
Air-blast pressure, Brown compass, 61
Anschütz (1910) compass—
Air-blast damping system, 42 et seq.
Damping curve, 50
Latitude error, cause of, 65
— — correction for, 67
— — value of, 68
Magnitude of directive force at equator, 23
Non-gyroscopic details, 138
Period of vibration of axle, 33, 37
Peripheral speed of wheel, 47
Quadrantal error, 96, 107, 120
Weight, diameter, and speed of wheel, 23
Weight of sensitive element, 30
Wheel tested to destruction, 140
Anschütz (1912) compass—
Absence of latitude error, 158
Directive force, value of, 125
Fourth gyro type, 128
Gyro-wheels, details of, 159
Non-gyroscopic details, 154
Oil damping system, 156
Quadrantal error, 107, 120, 126
Repeater compasses, 162
Temperature rise, 160
Weight, diameter, and speed of wheels, 123
Ballistic deflection and error, 81 et seq.
Ballistic deflection, dead-beat, 87
Ballistic deflection, tests by British Admiralty, 89
Ballistic gyro, Sperry compass, 111
Brown compass—
Absence of latitude error, 66
Air-blast pressure, 61
Compensator weights, 134
Damping bottles, 61
— system, 59 et seq.
Generation of directive force, 116
Magnitude of directive force at equator, 23
Non-gyroscopic details, 148
Oil control bottles, 113
On due west course, 117
Quadrantal error, 113, 126
Repeater compasses, 154, 162
Weight, diameter, and speed of wheel, 23
Weight of sensitive element, 30
Centrifugal forces during quadrantal rolling, 130 et seq.
Clock, gyroscopic, 16
Compensator weights, 134
Correction mechanism for latitude and north steaming errors, 75
Course correction or cosine ring, 77
Damped and free motion of gyro-axle, 49
Damped and undamped vibrations, 35 et seq.
Damping curve, 50
— systems, 42, 43, 52, 59, 156
— vibrations of gyro-compass, 29
Dead-beat ballistic deflection, 87
Details of gyro-wheels, 23, 159
Directive force, value of, at equator, 23, 125
Directive force, effective, 28
Effect of rolling on due west course, 93, 98, 99
Effect of rolling on due north course, 94
Effect of rolling on north-west course, 101
Elementary gyro-compass, 18
— — at equator, 20, 26
— — at 55 deg. N. lat., 24
— — near North Pole, 26
Elementary gyroscope at equator, 15
Elementary gyroscopic phenomena, 4 et seq.
Elimination of the quadrantal error, 107
Excentric pin, action of, 55 et seq.
— — stabilisation of, 110, 112
External gimbal mounting, 13, 97
Fourth gyro type of Anschütz compass, 128
Free and damped motion of gyro-axle, 49
Friction, solid and fluid, 39, 40
Generation of directive force, 18, 116
German submarines, 96, 120, 128
Gimbal mounting, external, 13, 97
Gyro-axle, free and damped motion of, 49
Gyroscope at equator, 15
— with three degrees of freedom, 4 et seq.
Gyroscope and rotation of the earth, 15
Gyroscopic compass at equator, 20, 26
Gyroscopic compass at 55 deg. N. lat., 24
Gyroscopic compass near North Pole, 26
Gyroscopic phenomena, elementary, 4 et seq.
Gyro-wheels, details of, 23, 159
Latitude bail corrector, 69
— corrector dial, 76
— error, 65
— — absence of, 66, 158
— — cause of, 65, 66
— — correction of, 67, 75
— — value of, 68, 69, 75
Magnetic compass, 1, 23, 30
Magnitude of directive force at equator, 23, 125
North steaming error, 70
— — — correction mechanism, 75
— — — value of, 74, 79
Oil control bottles, 113
— damping system, 156
Pendulum, simple, 31, 81
Period of rolling of a ship, 95
— — vibration of gyro-axle, 33, 37, 88
Peripheral speed of gyro-wheel, 47
Phantom ring, 53
Quadrantal error, 91, 96, 107, 120
Quadrantal error, elimination of, 107, 108, 113, 120, 126
Quadrantal error, value of, 107
— rolling, centrifugal forces during, 130 et seq.
Repeater compasses, 79, 80, 146, 152, 162
Rolling of a ship, period of, 95
— on due north course, 93, 98, 99
— — — west course, 94
— — north-west course, 101
— quadrantal, centrifugal forces during, 130 et seq.
Rotation of the earth and the gyroscope, 15
Simple pendulum, 31, 81
Sperry compass—
Bail, 54
Ballistic gyro, 111
Compensator weights, 134
Course corrector or cosine ring, 77
Damping system, 52
Directive force, magnitude at equator, 23
Excentric pin, action of, 55 et seq.
Excentric pin, stabilisation of, 110, 112
Latitude bail corrector, 69
— corrector dial, 76
— error, cause of, 66
— — correction of, 67, 75
Latitude error, value of, 69
Non-gyroscopic details, 142
North steaming error, correction of, 75, et seq.
On north-west course, 108
Phantom ring, 53
Quadrantal error, 108, 126
Repeater compasses, 146
Speed correction dial, 77
Vacuum in wheel casing, 52
Weight, diameter, and speed of wheel, 23
Weight of sensitive element, 30
Submarines, German, 96, 120, 128
Temperature rise in Anschütz compass, 160
Test of Anschütz wheel to destruction, 140
Vacuum in Sperry casing, 52
Vibration period of Anschütz compass, 33, 37
Vibration period of gyro-axle, standard, 88
Vibrations, damped and undamped, 35 et seq.
Weight, diameter, and speed of gyro-wheel, 23, 123
Weight of sensitive element, 30
Printed in Great Britain at The Mayflower Press, Plymouth. William Brendon & Son, Ltd.