X   CONTENTS

ART.   PAGE

§2. The Inactive Type of Gyro Ship Stabilizer

88. The Effect on the Motion of a Swinging Pendulum Produced by an

Attached Gyroscope, (a) When the Precession of the Gyro-Axle

is Opposed by a Frictional Torque   136

89. The Effect of a Spinning Gyroscope on the Rolling of a Ship    140

90. The Schlick Ship Stabilizer    142

91. The Fieux Ship Stabilizer    144

§3. The Active Type of Gyro Ship Stabilizer

92. The Effect on the Motion of a Swinging Pendulum Produced by an

Attached Gyroscope, (b) When the Gyro-Wheel is acted upon by

a Torque about an Axis Perpendicular to the Spin-Axis and the

Axis of Vibration of the Pendulum   146

93. The Sperry Ship Stabilizer    147

94. Operation of the Sperry Ship Stabilizer    149

95. The Braking System    151

96. Rolling of a Ship Produced by a Gyro    152

97. Admiral Taylor's Formula. Solved Problem    153

CHAPTER V

NAVIGATIONAL COMPASSES

§1. The Various Types

98. The Altitude and Azimuth Method of Locating the Geographic

Meridian   162

99. The Directive Tendency of a Magnetic Compass    165

100. The Deviations of a Magnetic Compass on an Iron Ship    166 101. The Deviation of a Magnetic Compass Produced by a Rapid Turn 168

102. The Earth Inductor Compass    169

103. The Magneto Compass    169

104. The Sun Compass    170 105. The Apparent Motion of the Spin-Axle of an Unconstrained

Gyroscope Due to the Rotation of the Earth    172

106. The Meridian-Seeking Tendency of a Pendulous Gyroscope    173 107. The Meridian-Seeking Tendency of a Liquid-Controlled Non

Pendulous Gyroscope    176

108. Making a Gyroscope into a Gyro-Compass    177

109. The Meridian-Seeking Torque Acting on a Gyro-Compass    178

§2. The Natural Errors to Which the Gyro-Compass is Subject

110. The Latitude Error    182 111. The Error Due to the Velocity of the Ship. The Meridian-Steam

ing Error    182 112. The Deflection of the Axle of a Gyro-Compass Produced by

Acceleration of the Ship's Velocity    184 113. The Period of a Gyro-Compass that will have Zero Ballistic Deflec

tion Error when at a Particular Latitude    186

114. The Ballistic Damping Error    190

CONTENTS   Xi

ART.   PAGE

115. The Compass Error Due to Rolling of the Ship when on an Inter

cardinal Course. The Quadrantal or Rolling Error    191 116. Quadrantal Deflection Due to Lack of Symmetry of the Sensitive

Element    195

117. The Suppression of the Quadrantal Error    195

118. The Degree of Precision of Gyro-Compasses    196

§3. The Sperry Gyro-Compass

119. The Principal Parts of the Master Compass    198

120. The Follow-Up System    202

121. The Method of Damping    203 122. The Magnitude of the Latitude Error for which Correction Must

Be made in the Sperry Gyro-Compass   205

123. Correction Mechanism for Velocity and Latitude Errors    206

124. Avoidance of the Ballistic Deflection Error    210

125. The Automatic Ballistic Damping Error Eliminator    212

126. Avoidance of the Quadrantal or Rolling Error    212

127. The Repeater System    213

§4. The Brown Gyro-Compass

128. Production of the Meridian-Seeking Torque    215

129. The Method of Damping    218

130. Absence of Latitude Error    220

131. The Meridian-Steaming Error    220

132. The Repeater System    221

133. The Ballistic Deflection Error    222

134. Prevention of the Quadrantal or Rolling Error   222

§5. The Anschutz Gyro-Compass

135. The Sensitive Element of the Model of 1926    224

136. The Supporting System    227

137. Damping   228

138. The Meridian-Steaming Error    231

139. Prevention of the Ballistic Deflection Error    231

140. Avoidance of the Quadrantal or Rolling Error   232

141. The Follow-Up Repeater System    234

§6. The Arma Gyro-Compass

142. The Sensitive Element    236

143. The Follow-Up System    238

144. The Course and Speed Error Corrector    241

145. Prevention of the Ballistic Deflection Error    244

146. Avoidance of the Ballistic Damping Error    246

147. Avoidance of the Quadrantal or Rolling Error    247

§7. The Florentia Gyro-Compass

148. Arrangement of the Principal Parts of the Master Compass    247

149. The Follow-Up System    248