Figure 4-29.--Earth rate and constant torque compensation signals.

Figure 4-29.--Earth rate and constant torque compensation signals.

signal from the electrolytic bubble level is not zero, and

speed and the reciprocal of the cosine of the latitude.

persists for a long period of time, such as mechanical

This output signal on the rotor of the resolver is

unbalance of the compass would cause, the rotor of the

multiplied by the sine of the ship's latitude in the sine

linear synchro (B 13) will turn gradually at a constant

stator winding, being proportional to the product of

rate. The output voltage, being of opposite phase to the

east-west speed and the tangent of the ship's latitude;

the signal is the meridian gyro east-west speed

compensation signal.

The meridian gyro constant torque compensation

system (fig. 4-29) consists of a type 1 amplifier, an

integrator cutout, and a meridian control integrator. The

meridian control integrator includes a motor-tachometer

(B12) and a linear synchro (B13). The dial provides

visual indication of integrator operation.

The meridian gyro compensated tilt signal is fed

through a relay in the integrator cutout, in series with

the damping voltage output of the generator section of

the motor-tachometer (B13) to the input of the type 1

computer amplifier.

The amplifier output drives the motor section of the

motor-tachometer (B12), which is geared down (3

million to 1) to the linear synchro. Because of this high

gear reduction, it takes a great number of motor

revolutions over a period of time to appreciable y rot ate

the rotor of the linear synchro (B 13). The linear synchro,

therefore, for all practical purposes, does not respond to

short-time signals, but responds to long-time signals or the

Figure 4-30.--Simplified diagram of the azimuth follow-up

system.

sum of fluctuating and short-time signals. If the average

4-28